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Equity (Details) - Changes in AOCL/I by Component (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     $ 60,878  
Other comprehensive (loss) income, net of tax $ (1,057) $ 1,427 794 $ (3,601)
Ending balance 853,675   853,675  
Interest Rate Swaps        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (3,977) (10,212) (1,409) (3,079)
Change in AOCL/I before reclassifications to income (3,528) (3,095) (6,921) (11,452)
Reclassifications from AOCL/I to income during the period 1,398 1,149 2,223 2,373
Other comprehensive (loss) income, net of tax (2,130) (1,946) (4,698) (9,079)
Ending balance (6,107) (12,158) (6,107) (12,158)
Defined Benefit Pension Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (5,749) (4,795) (5,797) (4,832)
Change in AOCL/I before reclassifications to income 0 0 0 0
Reclassifications from AOCL/I to income during the period 49 38 97 75
Other comprehensive (loss) income, net of tax 49 38 97 75
Ending balance (5,700) (4,757) (5,700) (4,757)
Foreign Currency Translation Adjustments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (38,106) (34,423) (42,477) (36,491)
Change in AOCL/I before reclassifications to income 1,024 3,335 5,395 5,403
Reclassifications from AOCL/I to income during the period 0 0 0 0
Other comprehensive (loss) income, net of tax 1,024 3,335 5,395 5,403
Ending balance (37,082) (31,088) (37,082) (31,088)
AOCI Attributable to Parent        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (47,832) (49,430) (49,683) (44,402)
Change in AOCL/I before reclassifications to income (2,504) 240 (1,526) (6,049)
Reclassifications from AOCL/I to income during the period 1,447 1,187 2,320 2,448
Other comprehensive (loss) income, net of tax (1,057) 1,427 794 (3,601)
Ending balance $ (48,889) $ (48,003) $ (48,889) $ (48,003)