Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details)

v3.8.0.1
Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
December 31, 2017 $ 786,760  
Other comprehensive income (loss) before reclassifications 2,691  
Amounts reclassified out of accumulated other comprehensive income (loss) 223  
Other comprehensive income (loss) 2,914 $ 1,303
March 31, 2018 768,717  
Other comprehensive income (loss) before reclassifications, tax expense 1,046  
Amounts reclassified out of accumulated other comprehensive income (loss), tax expense 84  
Gains and Losses on Cash Flow Hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
December 31, 2017 1,750  
Other comprehensive income (loss) before reclassifications 2,691  
Amounts reclassified out of accumulated other comprehensive income (loss) 223  
Other comprehensive income (loss) 2,914  
March 31, 2018 4,664  
Defined Benefit Pension Plan    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
December 31, 2017 (443)  
Other comprehensive income (loss) before reclassifications 0  
Amounts reclassified out of accumulated other comprehensive income (loss) 0  
Other comprehensive income (loss) 0  
March 31, 2018 (443)  
Accumulated Other Comprehensive Income (Loss)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
December 31, 2017 1,307  
March 31, 2018 $ 4,221