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Income Taxes and Related Payments - Components of provision for income taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Federal $ 7,074 $ 7,472 $ 12,114 $ 15,082
State and local 1,021 929 1,541 1,910
Foreign 65 73 163 150
Total 8,160 8,474 13,818 17,142
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Federal 7,886 170 14,629 2,946
State and local 451 6 (6,868) (230)
Total 8,337 176 7,761 2,716
Income tax expense $ 16,497 $ 8,650 $ 21,579 $ 19,858