Equity Incentive Plans - Summary of Nonvested Service Period Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-Average Grant-Date Fair Value Per Share, Granted	$ 7.66	$ 8.35	$ 5.40
Service Period Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Nonvested Beginning Balance	953,772	189,234
Shares, Granted	3,275	255,585
Shares, Modified from Performance Based Options to Service Period Stock Options		680,753
Number of Options, Vested	(372,464)	(171,059)
Number of Options, Forfeited	(370)	(741)
Number of Options, Nonvested Ending Balance	584,213	953,772	189,234
Weighted-Average Grant-Date Fair Value Per Share, Nonvested Beginning Balance	$ 8.16	$ 6.02
Weighted-Average Grant-Date Fair Value Per Share, Granted	7.67	6.34
Weighted Average Grant-Date Fair Value Per Shares, Modified from Performance Based Options to Service Period Stock Options		8.90
Weighted-Average Grant-Date Fair Value Per Share, Vested	8.22	5.83
Weighted-Average Grant-Date Fair Value Per Share, Forfeited	6.34	6.25
Weighted-Average Grant-Date Fair Value Per Share, Nonvested Ending Balance	$ 8.13	$ 8.16	$ 6.02
Performance Based Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Nonvested Beginning Balance	913,278	680,753
Shares, Granted	3,275	255,585	11,094
Shares, Modified from Exit Event Options to Performance Based Options		657,693
Shares, Modified from Performance Based Options to Service Period Stock Options		(680,753)
Number of Options, Forfeited	(370)
Number of Options, Nonvested Ending Balance	916,183	913,278	680,753
Weighted-Average Grant-Date Fair Value Per Share, Nonvested Beginning Balance	$ 8.50	$ 5.85
Weighted-Average Grant-Date Fair Value Per Share, Granted	7.64	6.41
Weighted-Average Grant-Date Fair Value Per Share, Modified from Exit Event Options to Performance Based Options		9.31
Weighted Average Grant-Date Fair Value Per Shares, Modified from Performance Based Options to Service Period Stock Options		(5.85)
Weighted-Average Grant-Date Fair Value Per Share, Forfeited	6.41
Weighted-Average Grant-Date Fair Value Per Share, Nonvested Ending Balance	$ 8.50	$ 8.50	$ 5.85
Exit Event Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Nonvested Beginning Balance		876,924
Shares, Granted	0		5,177
Number of Options, Cancelled		(219,231)
Shares, Modified from Exit Event Options to Performance Based Options		(657,693)
Number of Options, Nonvested Ending Balance			876,924
Weighted-Average Grant-Date Fair Value Per Share, Nonvested Beginning Balance		$ 5.85
Weighted-Average Grant-Date Fair Value Per Share, Cancelled		5.85
Weighted-Average Grant-Date Fair Value Per Share, Modified from Exit Event Options to Performance Based Options		$ 5.85
Weighted-Average Grant-Date Fair Value Per Share, Nonvested Ending Balance			$ 5.85