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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.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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