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Unaudited Quarterly Consolidated Financial Information Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations | $ (30,377) | $ 2,685 | $ 29,446 | $ 15,582 | $ (39,787) | $ (1,215) | $ 20,605 | $ 14,243 | $ 17,336 | $ (6,154) | $ (72,324)
Increase (decrease) in Revenue (percent) |  |  |  |  | (10.20%) |  |  |  |  |  |
Scenario, Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations | 9,400 |  |  |  |  |  |  |  |  |  |
Charges related to noncash write-off and contract termination fee | $ 6,300 |  |  |  |  |  |  |  |  |  |
Marketing expense |  |  |  |  |  |  | $ 18,300 |  |  |  |

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- Definition Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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