Stock-Based Compensation - Exercise Price Range (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding (in shares)	4,691
Options Outstanding, Weighted- Average Remaining Contractual Life	3 years 4 months 27 days
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 17.41
Options Exercisable, Number Exercisable	1,809
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 20.95
$8.24 - $8.24 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding (in shares)	833
Options Outstanding, Weighted- Average Remaining Contractual Life	3 years 7 months 10 days
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 8.24
Options Exercisable, Number Exercisable	278
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 8.24
$8.25- $8.25 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding (in shares)	91
Options Outstanding, Weighted- Average Remaining Contractual Life	3 years 7 months 21 days
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 8.25
Options Exercisable, Number Exercisable	30
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 8.25
$11.65 - $11.65 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding (in shares)	1,700
Options Outstanding, Weighted- Average Remaining Contractual Life	3 years 6 months 4 days
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 11.65
Options Exercisable, Number Exercisable	567
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 11.65
$22.50 - $22.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding (in shares)	1,700
Options Outstanding, Weighted- Average Remaining Contractual Life	3 years 6 months 4 days
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 22.50
Options Exercisable, Number Exercisable	567
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 22.50
$23.70 - $52.98 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding (in shares)	294
Options Outstanding, Weighted- Average Remaining Contractual Life	2 years 0 months 3 days
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 40.94
Options Exercisable, Number Exercisable	294
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 40.94
$53.91 - $53.91 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding (in shares)	74
Options Outstanding, Weighted- Average Remaining Contractual Life	2 years 1 month 0 days
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 53.91
Options Exercisable, Number Exercisable	74
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 53.91