Share-Based Compensation (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Type $ / shares shares	Jun. 30, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Types of share based awards | Type			3
Share-based compensation costs | $	$ 1,900	$ 2,900	$ 3,400	$ 5,300
Stock Options [Member]
Shares [Roll Forward]
Outstanding, beginning of period (in shares) | shares			1,024
Granted (in shares) | shares			0
Exercised (in shares) | shares			(222)
Forfeited (in shares) | shares			0
Expired (in shares) | shares			(45)
Outstanding, end of period (in shares) | shares	757		757
Exercisable, end of period (in shares) | shares	732		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			12.69
Forfeited (in dollars per share) | $ / shares			0
Expired (in dollars per share) | $ / shares			45.36
Outstanding, end of period (in dollars per share) | $ / shares	$ 12.54		12.54
Exercisable, end of period (in dollars per share) | $ / shares	$ 12.40		$ 12.40
Weighted Average Remaining Contractual Term [Abstract]
Outstanding			4 years 4 months 24 days
Exercisable			4 years 3 months 18 days
Aggregate Intrinsic Value [Abstract]
Outstanding | $	$ 20,661		$ 20,661
Exercisable | $	$ 20,083		$ 20,083
Restricted Stock and Restricted Stock Units [Member]
Shares [Roll Forward]
Nonvested, beginning of period (in shares) | shares			939
Granted (in shares) | shares			113
Vested (in shares) | shares			(230)
Forfeited (in shares) | shares			(44)
Nonvested, end of period (in shares) | shares	778		778
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			30.56
Vested (in dollars per share) | $ / shares			11.99
Forfeited (in dollars per share) | $ / shares			11.64
Nonvested, end of period (in dollars per share) | $ / shares	$ 16.07		$ 16.07
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		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		$ 9.01
Discontinued Operations [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation costs | $		$ 1,000		$ 1,800