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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of 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 $ 4,443 4,411 $ 4,710
Unrealized (losses) gains on interest rate swaps and interest rate caps, income tax expense (benefit) (929) (2,358) (3,825)
Unrealized holding (losses) gains on available for sale securities, income tax expense (benefit) 250 (405) (614)
Pension liability adjustments, income tax expense (benefit) (13,057) $ 773 $ 7,589
Other, income tax (benefit) $ (3,705)