Income Taxes - Schedule of Differences Between Federal Tax Rate and Company's Effective Tax Rate for Results of Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended												6 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Jun. 30, 2016	[1]	Jun. 30, 2015	[1]	Sep. 30, 2016	[1]	Sep. 30, 2015	[1]	Dec. 31, 2016	Dec. 31, 2015	[1]	Dec. 31, 2014	[1]
Income Taxes [Abstract]
U.S. tax at statutory rate																					$ 11,351	$ 11,991		$ 11,252
State income taxes, net of federal benefit																					945	1,337		1,474
Excess equity compensation deduction																					(911)	0		0
Non-deductible expenses																					495	319		292
Total income tax provision for continuing operations	$ 2,753		$ 3,802		$ 2,172		$ 3,465		$ 4,221		$ 2,685		$ 5,974		$ 6,906		$ 8,727		$ 10,371		$ 11,880	$ 13,647		$ 13,018
U.S. tax at statutory rate																					35.00%	35.00%		35.00%
State income taxes, net of federal benefit																					2.90%	3.90%		4.60%
Excess equity compensation deduction																					(2.80%)	0.00%		0.00%
Nondeductible expenses																					1.50%	0.90%		0.90%
Total																					36.60%	39.80%		40.50%

[1] as restated