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Income Taxes - Income tax provision (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ 26,015 $ 25,515 $ 25,285
State 4,869 4,538 4,490
Total current 30,884 30,053 29,775
Deferred:      
Federal (7,748) (3,634) 141
State (646) (311) 344
Total deferred (8,394) (3,945) 485
Total provision for income taxes $ 22,490 $ 26,108 $ 30,260