Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Summary of Activity for Non-voting Time-vested Restricted Stock

The following table summarizes the activity for non-voting time-vested restricted stock units granted to non-employee directors for the year ended December 31, 2017.

	Share Units		Weighted Average Grant-Date Fair Value		Remaining Average Contractual Life (in years)	Aggregate Value (in thousands)
Outstanding at January 1, 2017	11,559		$	23.01	2.13	$	266
Granted	10,323		11.91
Forfeited	—		—
Vested and released to participants	(2,202	)	44.04
Outstanding at December 31, 2017	19,680		$	14.94	2.71	$	292

Non-Voting Time-Vested Restricted Stock Units [Member]

Summary of Activity for Non-voting Time-vested Restricted Stock

The following table summarizes the activity for non-voting time-vested restricted stock units granted to employees for the year ended December 31, 2017.

	Share Units		Weighted Average Grant-Date Fair Value		Remaining Average Contractual Life (in years)	Aggregate Value (in thousands)
Outstanding at January 1, 2017	202,560		$	37.91	1.25	$	7,679
Granted	480,065		11.42
Forfeited	(10,211	)	10.01
Vested and released to participants	(137,703	)	41.76
Outstanding at December 31, 2017	534,711		$	12.80	2.26	$	6,844

Non-Voting Performance Based Restricted Stock Units [Member]

Summary of Activity for Non-voting Time-vested Restricted Stock

The following table summarizes the activity for non-voting performance-based restricted stock units for the year ended December 31, 2017.

	Share Units		Weighted Average Grant-Date Fair Value		Remaining Average Contractual Life (in years)	Aggregate Value (in thousands)
Outstanding at January 1, 2017	569,418		$	25.83	1.19	$	14,708
Granted	371,045		15.11
Forfeited	(122,313	)	41.64
Vested and released to participants	—		—
Outstanding at December 31, 2017	818,150		$	18.60	1.20	$	15,218