Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands |
3 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
Jan. 01, 2018 |
Dec. 31, 2017 |
|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||||
| Increase (decrease) in retained earnings | $ 238,378 | $ 231,390 | $ 235,844 | |
| Decrease in revenues | (167,410) | $ (134,610) | ||
| Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 | ||||
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||||
| Increase (decrease) in retained earnings | (3,345) | $ (4,454) | ||
| Decrease in revenues | $ 829 | |||
| 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 | ||||||||||
- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|