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Credit Arrangements and Debt Obligations Credit Arrangements and Debt Obligations - Effect of Derivatives on Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]      
Unrealized gain on derivatives, before reclassification, before tax $ 4,549 $ 3,258  
Unrealized gain on derivatives, before reclassification, tax (1,224) (1,303)  
Unrealized gain on derivatives, before reclassification, net of tax 3,325 1,955  
Reclassification adjustment from AOCI on derivatives, before tax 415 (509)  
Reclassification adjustment from AOCI on derivatives, tax (123) 204  
Reclassification adjustment from AOCI on derivatives, net of tax 292 (305)  
Derivatives qualifying as hedges, before tax 4,134 3,767  
Derivatives qualifying as hedges, tax (1,101) (1,507)  
Unrealized gain on interest rate swaps, net of tax 3,033 $ 2,260 $ 0
Loss that will be reclassified from accumulated other comprehensive income to interest expense $ 3,200