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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]      
Fees associated with termination of interest rate swaps, income tax (benefit)     $ (2,244)
Amounts reclassified from accumulated other comprehensive loss to interest expense, income tax expense $ 3,066 $ 4,443 4,411
Unrealized (losses) gains on interest rate swaps and interest rate caps, income tax expense (benefit) 362 (929) (2,358)
Unrealized holding (losses) gains on available for sale securities, income tax expense (benefit) 1,685 250 (405)
Pension liability adjustments, income tax expense (benefit) 2,601 (13,057) $ 773
Other, income tax (benefit) $ 342 $ (3,705)