Share-Based Compensation (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Award $ / shares shares	Mar. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Types of share based awards | Award	4
Share-based compensation costs | $	$ 1,400	$ 2,400
Stock Options [Member]
Shares [Roll Forward]
Outstanding, beginning of period (in shares) | shares	1,024
Granted (in shares) | shares	0
Exercised (in shares) | shares	(181)
Forfeited (in shares) | shares	0
Expired (in shares) | shares	(45)
Outstanding, end of period (in shares) | shares	798
Exercisable, end of period (in shares) | shares	732
Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 14.02
Granted (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	12.36
Forfeited (in dollars per share) | $ / shares	0
Expired (in dollars per share) | $ / shares	45.36
Outstanding, end of period (in dollars per share) | $ / shares	12.63
Exercisable, end of period (in dollars per share) | $ / shares	$ 12.33
Weighted Average Remaining Contractual Term [Abstract]
Outstanding	4 years 8 months 12 days
Exercisable	4 years 6 months
Aggregate Intrinsic Value [Abstract]
Outstanding | $	$ 13,139
Exercisable | $	$ 12,275
Restricted Stock and Restricted Stock Units [Member]
Shares [Roll Forward]
Nonvested, beginning of period (in shares) | shares	939
Granted (in shares) | shares	4
Vested (in shares) | shares	(98)
Forfeited (in shares) | shares	(37)
Nonvested, end of period (in shares) | shares	808
Weighted-Average Grant Date Fair Value [Roll Forward]
Nonvested, beginning of period (in dollars per share) | $ / shares	$ 13.11
Granted (in dollars per share) | $ / shares	27.97
Vested (in dollars per share) | $ / shares	10.47
Forfeited (in dollars per share) | $ / shares	11.70
Nonvested, end of period (in dollars per share) | $ / shares	$ 13.57
Market Stock Units [Member]
Shares [Roll Forward]
Nonvested, beginning of period (in shares) | shares	406
Granted (in shares) | shares	0
Vested (in shares) | shares	(8)
Forfeited (in shares) | shares	(25)
Nonvested, end of period (in shares) | shares	373
Weighted-Average Grant Date Fair Value [Roll Forward]
Nonvested, beginning of period (in dollars per share) | $ / shares	$ 8.75
Granted (in dollars per share) | $ / shares	0
Vested (in dollars per share) | $ / shares	5.46
Forfeited (in dollars per share) | $ / shares	5.95
Nonvested, end of period (in dollars per share) | $ / shares	$ 9.01
Discontinued Operations [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation costs | $	$ 800	$ 10,200