Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Equity Instruments Other Than Options, Activity

The table below summarizes award activity.

	Three Months Ended
	March 31, 2018				March 31, 2017
	Number of Awards		Weighted average grant-date fair value		Number of Awards		Weighted average grant-date fair value
Outstanding at beginning of period	873,849		$	12.30	1,040,569		$	9.97
Granted	206,695		26.53		243,940		17.52
Converted	(96,616	)	10.89		(173,210	)	9.69
Expired	—		—		—		—
Forfeited	—		—		(3,800	)	13.66
Outstanding at end of period	983,928		$	15.43	1,107,499		$	11.66
Vested	326,928		$	7.18	324,599		$	6.39