Equity-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2018

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

Stock Options Outstanding [Table Text Block]

A summary of performance-based unvested stock unit activity is as follows:

(stock units in thousands)	Units (in thousands)		Weighted Average Grant-Date Fair Value
Unvested at December 31, 2015	421		$	18.09
Vested	(140	)	17.90
Forfeited	(20	)	16.83
Unvested at December 31, 2016	261		$	17.98
Vested	(141	)	17.90
Forfeited	(6	)	18.23
Unvested at December 31, 2017	114		$	18.06
Vested	(114	)	18.06
Forfeited	—		—
Unvested at December 31, 2018	—		$	—

Restricted Stock and Restricted Stock Units Activity [Table Text Block]

A summary of the activity of our unvested restricted stock and stock unit awards are presented in the following table:

	Shares/units  (in thousands)		Weighted Average Grant-Date Fair Value
Unvested at December 31, 2015	767		$	14.34
Granted	730		8.76
Vested and distributed	(269	)	12.90
Forfeited	(53	)	11.60
Unvested at December 31, 2016	1,175		$	11.30
Granted	496		12.43
Vested and distributed	(306	)	11.91
Forfeited	(58	)	12.28
Unvested at December 31, 2017	1,307		$	11.55
Granted	730		9.35
Vested and distributed	(457	)	10.91
Forfeited	(164	)	11.31
Unvested at December 31, 2018	1,416		$	10.65

Restricted Stock And Restricted Stock Units Vesting Term [Table Text Block]

The vesting provisions for the restricted stock and stock unit awards and the related number of shares granted during the year ended December 31 are as follows:

	Shares/units (in thousands)
Vesting Terms	2018	2017	2016
25% per year for four years	—	—	8
100% immediately	132	106	123
33.3% per year for three years	452	85	599
100% on February 14, 2020	—	305	—
100% on July 31, 2018	146	—	—
Total restricted stock and stock units granted	730	496	730