Fair Value Measurements and Derivative Instruments (Carrying amounts and fair value of the financial instruments) (Details) - USD ($) $ in Thousands |
Mar. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Senior Notes Due 2021 | Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Debt stated percentage | 6.75% | |
| Senior Notes Due 2025 | Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Debt stated percentage | 6.875% | |
| Carrying Value [Member] | ||
| Debt Instrument [Line Items] | ||
| Current and long-term debt | $ 1,337,989 | $ 1,332,739 |
| Fair Value [Member] | ||
| Debt Instrument [Line Items] | ||
| Current and long-term debt | $ 1,393,992 | $ 1,390,743 |
| X | ||||||||||
- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|