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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Revenue from Contract with Customer, Excluding Assessed Tax | $ 446,345 | [1] | $ 399,537 | $ 339,676 | $ 345,611 | $ 373,501 | [1] | $ 373,502 | $ 356,185 | $ 300,129 | $ 1,531,169 | $ 1,403,317 | $ 1,142,487 |
Contract with Customer, Liability, Revenue Recognized |  |  |  |  |  |  |  |  |  |  | 22,100 |  |  |
Revenue, Remaining Performance Obligation | 1,060,000 |  |  |  |  |  |  |  |  |  | 1,060,000 |  |  |
Retained Earnings (Accumulated Deficit) | $ 174,736 |  |  |  |  | $ 143,241 |  |  |  |  | 174,736 | $ 143,241 |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700
[1] | Results for the fourth quarter of 2017 include a net 2017 Tax Act benefit of $7.8 million, or $0.48 and $0.47 per basic and diluted share, respectively.

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