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Summary of Significant Accounting Policies - Cash and Cash Equivalents and Foreign Currency (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | ||
|---|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
Dec. 31, 2014
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| Cash and Cash Equivalents and Restricted Cash [Abstract] | |||
| Restricted cash | $ 20,000 | $ 33,860 | |
| Foreign Currency | |||
| Foreign currency transaction gains (loss) | $ 22,266 | $ 6,438 | |
| The 7 1/4% Notes | |||
| Foreign Currency | |||
| Stated interest rate (as a percent) | 7.25% | 7.25% | |
| 6 3/4% Notes | |||
| Foreign Currency | |||
| Stated interest rate (as a percent) | 6.75% | 6.75% | |