CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands |
12 Months Ended | ||
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Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
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| Tax effect on fair value of interest rate swap agreements | $ 205 | $ 1,769 | $ 6,514 |
| Tax expense (benefit) associated with change in pension actuarial (income) loss | $ 280 | ||
| Dividends declared per common share | $ 0.11 | $ 0.10 | $ 0.10 |
| Convertible senior notes due | 2029 | ||
| Accumulated Other Comprehensive Income (Loss) [Member] | |||
| Tax effect on fair value of interest rate swap agreements | $ 205 | $ 1,769 | $ 6,514 |
| Tax expense (benefit) associated with change in pension actuarial (income) loss | $ 280 | $ (446) | $ 460 |
| Retained Earnings [Member] | |||
| Dividends declared per common share | $ 0.11 | $ 0.10 | $ 0.10 |
| Paid-In Capital [Member] | |||
| Stated interest rate on debt agreement | 5.00% | ||
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- Definition Debt instrument maturity period. No definition available.
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of tax expense (benefit) related to (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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