Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income Loss (Details)

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Accumulated Other Comprehensive Income Loss (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Summary of Changes in accumulated other comprehensive income (loss)    
Beginning balance at December 31, 2012, Gains and Losses on Cash Flow Hedges $ (19,488)  
Beginning balance at December 31, 2012, Defined Benefit Pension Plan (475)  
Beginning balance at December 31, 2012, Total Accumulated Other Comprehensive Income (Loss) (19,963)  
Other comprehensive income (loss) before reclassifications, Gains and Losses on Cash Flow Hedges 31  
Other comprehensive income (loss) before reclassifications, Defined Benefit Pension Plan     
Other comprehensive income (loss) before reclassifications, Total Accumulated Other Comprehensive Income (Loss) 31  
Amounts reclassified out of accumulated other comprehensive income (loss), gains and losses on cash flow hedges 1,756  
Amounts reclassified out of accumulated other comprehensive income (loss), defined benefit pension plan     
Amounts reclassified out of accumulated other comprehensive income (loss), Total Accumulated Other Comprehensive Income (Loss) 1,756  
Fair value of interest rate swap agreements, net of tax expense of $1094 1,787 1,741
Net current-period other comprehensive income (loss), Defined Benefit Pension Plan     
Net current-period other comprehensive income (loss), Total Accumulated Other Comprehensive Income (Loss) 1,787  
Ending balance at March 31, 2013, Gains and Losses on Cash Flow Hedges (17,701)  
Ending balance at March 31, 2013, Defined Benefit Pension Plan (475)  
Ending balance at March 31, 2013, Total Accumulated Other Comprehensive Income (Loss) $ (18,176)