Treasury Stock Treasury Stock - Quarterly (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Treasury Stock, Shares [Roll Forward]
Treasury stock, shares, beginning of period	23,507,656
Treasury stock, shares, end of period	25,397,576
Treasury stock, cost, beginning of period	$ 79,771
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions	2,777	1,919
Treasury stock reissued, cost	0
Treasury stock, cost, end of period	89,753
Treasury Stock
Treasury Stock, Shares [Roll Forward]
Shares Paid for Tax Withholding for Share Based Compensation	529,905
Treasury stock reissued, shares	0
Purchase of treasury stock, shares	1,360,015
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions	2,777
Purchase of treasury stock, cost	$ 7,205
Treasury stock, average cost per share, beginning of period, in dollars per share	$ 3.39
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions, Average Cost Per Share	$ 5.24
Treasury stock reissued, average cost per share, in dollars per share	$ 0.00
Purchase of treasury stock, average cost per share, in dollars per share	$ 5.30
Treasury stock, average cost per share, end of period, in dollars per share	$ 3.53