Equity-Based Compensation - Restricted Stock Units (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Employee stock-based compensation expense
Expense from RSUs	$ 2,330,000	$ 1,453,000	$ 2,002,000
Excess tax benefit from share-based compensation	(261,000)	(2,770,000)	(736,000)
Net compensation cost	$ 2,069,000	(1,317,000)	1,266,000
2013 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized	2,365,793
Restricted Stock Units (RSUs)
Employee stock-based compensation expense
Expense from RSUs	$ 2,330,000	$ 1,453,000	$ 2,002,000
Restricted Stock Units
Nonvested at beginning of period	96,765
Granted	89,359
Shares vested (including tax withholding)	(53,779)
Forfeited	(5,334)
Nonvested at end of period	127,011	96,765
Nonvested at beginning of period, Weighted average grant date fair value per share	$ 30.80
Granted, Weighted average grant date fair value per share	33.24	$ 32.45	$ 0.00
Shares vested (including tax withhholding), Weighted average grant date fair value per share	29.75
Forfeited, Weighted average grant date fair value per share	30.02
Nonvested at end of period, Weighted average grant date fair value per share	$ 33.00	$ 30.80
Unrecognized compensation cost	$ 2,603,000
Period for recognition of RSU compensation expense	1 year 9 months 29 days
Additional shares available to grant under plan (in shares)	2,168,516