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Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Stock-based compensation costs |  |  |  |  |
Time period of historical volatility of stock used to estimate expected volatility |  |  | 5 years 3 months 18 days |  |
Accrued salaries and wages | $ 91,195 |  | $ 91,195 |  | $ 111,252
Dividend yield (as a percent) |  |  | 0.00% |  |
Granted (in shares) |  |  | 663,343 | 1,486,790 |
Weighted-average assumptions used in the Black-Scholes option-pricing model |  |  |  |  |
Risk-free interest rate (as a percent) |  |  | 2.26% | 1.97% |
Expected volatility (as a percent) |  |  | 30.80% | 30.67% |
Dividend yield (as a percent) |  |  | 0.00% |  |
Weighted-average expected life |  |  | 5 years 3 months 18 days | 5 years 3 months 18 days |
Employee stock options | General and administrative expenses |  |  |  |  |
Stock-based compensation costs |  |  |  |  |
Compensation costs related to stock-based compensation | 2,900 | $ 1,900 | $ 8,800 | $ 5,800 |
Phantom Share Units (PSUs) |  |  |  |  |
Stock-based compensation costs |  |  |  |  |
Accrued salaries and wages | 2,900 |  | 2,900 |  | 4,800
Total compensation cost related to nonvested awards not yet recognized | 5,300 |  | $ 5,300 |  |
Period for recognition of unrecognized compensation cost |  |  | 2 years 3 months 15 days |  |
Compensation costs related to stock-based compensation | 700 | 800 | $ 2,200 | 9,700 |
Amounts paid on cash settled awards | 0 | 8,200 | $ 4,200 | 11,800 |
Vesting period |  |  | 4 years |  |
Stock Appreciation Rights (SARs) |  |  |  |  |
Stock-based compensation costs |  |  |  |  |
Accrued salaries and wages | 21,500 |  | $ 21,500 |  | $ 24,000
Total compensation cost related to nonvested awards not yet recognized | 13,200 |  | $ 13,200 |  |
Period for recognition of unrecognized compensation cost |  |  | 2 years 2 months 16 days |  |
Compensation costs related to stock-based compensation | 1,100 | 3,100 | $ 6,900 | 11,700 |
Amounts paid on cash settled awards | $ 2,300 | $ 1,800 | $ 9,800 | $ 4,400 |
Vesting period |  |  | 4 years |  |

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- Definition Represents the time period of historical volatility of stock used to estimate expected volatility, in periods. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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