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Derivatives - Accumlated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Jan. 01, 2017
Jan. 01, 2016
Derivatives designated as cash flow hedges:            
Beginning balance $ 1,240,516 $ 995,728 $ 659,560      
Unrealized gain (loss) recognized in OCI (1) 6,187 (5,694) 335      
Gain (loss) reclassification from OCI (2,132) 1,144 1,023      
Less: Cumulative effect of adoption of new ASU (No. 2017-12) (3)       $ 1,992 $ 2,996 $ 86,461
Net gain (loss) on derivatives 989 (4,550) 1,358      
Ending balance 1,282,782 1,240,516 995,728      
Other expense (income) | Swap            
Derivatives designated as cash flow hedges:            
Gain (loss) reclassification from OCI (5,058)          
Accumulated net gain (loss) from cash flow hedges            
Derivatives designated as cash flow hedges:            
Beginning balance (4,113) 437 (921)      
Ending balance (3,124) (4,113) 437      
Tax (expense) benefit, unrealized gain (loss) recognized in OCI (2,415) 3,611 (220)      
Tax benefit (expense), (loss) gain reclassified from OCI to earnings 897 $ (725) $ (644)      
Tax (expense), cumulative effect of adoption of new asU (687)          
Accumulated net gain (loss) from cash flow hedges | Other expense (income) | Swap            
Derivatives designated as cash flow hedges:            
Tax benefit (expense), (loss) gain reclassified from OCI to earnings $ 1,847