|
Fair Value Measurements - Fair Value of Non-Current Financial Liabilities (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Long-term debt | $ 1,300,000 | $ 1,300,000 |
| Fair Value | Level 2 | ||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Long-term debt | $ 1,347,600 | $ 1,302,000 |