Stock Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Apr. 01, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2015	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted		240,000
Performance target, percent achieved		92.00%	97.00%
Shares available for grant (in shares)		1,614,107
Stock based compensation expense		$ 6,570	$ 6,114	$ 3,793
Total unrecognized stock based compensation expense		$ 8,000
Unrecognized stock based compensation expense, weighted average recognition period		1 year 1 month
Total value of restricted stock awards vested		$ 6,000	3,800	1,600
Recognized tax benefit		$ 3,500	$ 2,600	$ 700
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance (in shares)						3,636,363
Restricted shares granted (in shares)		493,524	392,126	370,959
Time-Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage of performance based restricted stock awards			50.00%
Years to vest			2 years
Performance-Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)		284,809	312,551	291,450
Vesting percentage of performance based restricted stock awards		33.33%
2012 Equity Incentive Plan | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price per share (in USD per share)					$ 25.82
Share-based Compensation Award, Tranche Three | 2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expected to vest (in shares)	120,000
Years to vest	3 years
Share-based Compensation Award, Tranche Four | 2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expected to vest (in shares)	120,000