Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016.

	Share Units			Weighted Average Grant-Date Fair Value			Remaining Average Contractual Life (in years)		Aggregate Value (in thousands)
Outstanding at January 1, 2016		8,805		$	31.50			2.21	$	277
Granted		5,040			15.19
Forfeited		—			—
Vested and released to participants		(2,286	)		(38.44	)
Outstanding at December 31, 2016		11,559		$	23.01			2.13	$	266

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, 2016.

	Share Units			Weighted Average Grant-Date Fair Value			Remaining Average Contractual Life (in years)		Aggregate Value (in thousands)
Outstanding at January 1, 2016		181,475		$	40.47			1.56	$	7,344
Granted		27,082			20.07
Forfeited		(837	)		(36.45	)
Vested and released to participants		(5,160	)		(34.45	)
Outstanding at December 31, 2016		202,560		$	37.91			1.25	$	7,679

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, 2016.

	Share Units			Weighted Average Grant-Date Fair Value			Remaining Average Contractual Life (in years)		Aggregate Value (in thousands)
Outstanding at January 1, 2016		394,956		$	34.07			1.83	$	13,456
Granted		310,481			15.71
Forfeited		(14,848	)		(28.95	)
Vested and released to participants		(121,171	)		(26.34	)
Outstanding at December 31, 2016		569,418		$	25.83			1.19	$	14,708