Stockholders Equity - Annual (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) class $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) shares	May. 19, 2015 USD ($) $ / shares shares
Equity, Class of Stock [Line Items]
Common stock, shares authorized	500,000,000
Treasury Stock, Shares [Roll Forward]
Treasury stock, shares, beginning of period	23,507,656
Purchase of treasury stock, shares	9,353,747
Treasury stock, shares, end of period	34,515,734	23,507,656
Treasury Stock, Cost [Roll Forward]
Treasury stock, cost, beginning of period | $	$ 79,771
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions | $	8,907	$ 5,649	$ 3,649
Treasury stock reissued, cost | $			$ (90)
Purchase of treasury stock, cost | $	48,678
Treasury stock, cost, end of period | $	$ 137,356	$ 79,771
Treasury Stock, Average Cost Per Share [Roll Forward]
Treasury stock, average cost per share, beginning of period, in dollars per share | $ / shares	$ 3.39
Purchase of treasury stock, average cost per share, in dollars per share | $ / shares	5.20
Treasury stock, average cost per share, end of period, in dollars per share | $ / shares	$ 3.98	$ 3.39
Number of classes | class	2
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Convertible Preferred Stock, Shares Issued upon Conversion				152.2476
Convertible Preferred Stock, Threshold Percentage of Stock Price Trigger	150.00%
Treasury Stock
Treasury Stock, Shares [Roll Forward]
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions	1,654,331
Treasury Stock, Cost [Roll Forward]
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions | $	$ 8,907
Treasury Stock, Average Cost Per Share [Roll Forward]
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions, Average Cost Per Share | $ / shares	$ 5.38
Convertible Preferred Stock
Equity, Class of Stock [Line Items]
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | $	$ 3,400
Preferred Stock, Liquidation Preference Per Share | $ / shares				$ 1,000
Preferred Stock, Dividend Rate, Percentage	5.625%
Dividends | $	$ 4,100
Common Stock Class A
Equity, Class of Stock [Line Items]
Common stock, shares authorized	250,000,000	250,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Treasury Stock, Shares [Roll Forward]
Treasury stock, shares, beginning of period	23,507,656
Treasury stock reissued, shares			(24,744)
Treasury stock, shares, end of period	34,515,734	23,507,656
Treasury Stock, Cost [Roll Forward]
Treasury stock, cost, beginning of period | $	$ 79,771
Treasury stock, cost, end of period | $	$ 137,356	$ 79,771
Common Stock Class B
Equity, Class of Stock [Line Items]
Common stock, shares authorized	250,000,000	250,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Call Option
Equity, Class of Stock [Line Items]
Option indexed to Issuer's Equity, Value | $				$ 15,900
Maximum
Equity, Class of Stock [Line Items]
Convertible Preferred Stock, Threshold Consecutive Trading Days	30 days
Maximum | Call Option
Equity, Class of Stock [Line Items]
Option Indexed to Issuer's Equity, Strike Price | $ / shares	$ 8.39
Minimum
Equity, Class of Stock [Line Items]
Convertible Preferred Stock, Threshold Consecutive Trading Days	20 days
Minimum | Call Option
Equity, Class of Stock [Line Items]
Option Indexed to Issuer's Equity, Strike Price | $ / shares	$ 6.57