|
Redeemable Convertible Preferred Stock (Details) (USD $)
In Thousands, except Share data in Millions, unless otherwise specified |
12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2013
Redeemable Convertible Preferred Stock
|
Dec. 31, 2012
Redeemable Convertible Preferred Stock
|
Dec. 31, 2011
Redeemable Convertible Preferred Stock
|
Dec. 31, 2010
Redeemable Convertible Preferred Stock
|
|
| Temporary Equity [Line Items] | |||||||
| Convertible Preferred Stock, Shares Issued | 8.1 | ||||||
| Preferred Stock, Dividend Rate, Percentage | 6.25% | ||||||
| Convertible Preferred Stock, liquidation preference per share | $ 50.00 | ||||||
| Dividends on preferred stock | $ 0 | $ 2,481 | $ 19,487 | ||||
| Conversion of redeemable convertible preferred stock | 8.3 | ||||||
| Redeemable convertible preferred stock, value | $ 0 | $ 0 | $ 305,032 | $ 316,581 | |||