Summary of Significant Accounting Policies - Adoption (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Accounting Changes and Error Corrections [Abstract] | ||
| Deferred Income Tax Liabilities, Net | $ 66,054 | $ 84,836 |
| Other Assets, Noncurrent | 28,874 | 42,894 |
| Prepaid Expense and Other Assets, Current | 70,022 | 65,609 |
| Senior Notes, Noncurrent | $ 659,150 | $ 656,564 |
| Percentage of revenue excluded from provisions of ASU 2014-09 | 40.00% |