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Summary of Significant Accounting Policies - Segment and Geographic Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Revenues and property and equipment, net by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Segment and Geographic Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business segments (segment) | segment |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Revenues and property and equipment, net by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 106,259 | $ 91,015 | $ 118,990 | $ 86,097 | $ 107,011 | $ 119,936 | $ 121,101 | $ 78,246 | $ 86,463 | $ 88,747 | $ 87,710 | $ 109,641 | $ 402,361 | [1] | $ 426,294 | [1] | $ 372,561 | [1]
Property and equipment, net | 111,825 |  |  |  | 158,205 | $ 171,548 | $ 170,507 | $ 165,620 |  |  |  |  | 111,825 |  | 158,205 |  |  |
Geographic area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues and property and equipment, net by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 402,361 |  | 426,294 |  | 372,561 |
Property and equipment, net | 111,825 |  |  |  | 158,205 |  |  |  |  |  |  |  | 111,825 |  | 158,205 |  |  |
Geographic area | Domestic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues and property and equipment, net by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 334,970 |  | 360,891 |  | 334,829 |
Property and equipment, net | 106,727 |  |  |  | 149,378 |  |  |  |  |  |  |  | 106,727 |  | 149,378 |  |  |
Geographic area | Foreign |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues and property and equipment, net by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 67,391 |  | 65,403 |  | $ 37,732 |
Property and equipment, net | $ 5,098 |  |  |  | $ 8,827 |  |  |  |  |  |  |  | $ 5,098 |  | $ 8,827 |  |  |
[1] | See Note 6 -Investments in Affiliates and Related Transactions for related party transactions reflected in this account

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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