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Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Stock-based compensation costs |  |  |  |  |
Time period of historical volatility of stock used to estimate expected volatility |  |  | 5 years 3 months 18 days |  |
Dividend yield (as a percent) |  |  | 0.00% |  |
Granted (in shares) |  |  | 1,475,224 | 1,561,035 |
Accrued salaries and wages | $ 86,292 |  | $ 86,292 |  | $ 92,238
Weighted-average assumptions used in the Black-Scholes option-pricing model |  |  |  |  |
Risk-free interest rate (as a percent) |  |  | 1.97% | 1.20% |
Expected volatility (as a percent) |  |  | 30.67% | 31.22% |
Dividend yield (as a percent) |  |  | 0.00% |  |
Weighted-average expected life |  |  | 5 years 3 months 18 days | 5 years 4 months 24 days |
Employee stock options | General and administrative expenses |  |  |  |  |
Stock-based compensation costs |  |  |  |  |
Compensation costs related to stock-based compensation | 1,800 | $ 1,600 | $ 4,000 | $ 3,100 |
Phantom Share Units (PSUs) |  |  |  |  |
Stock-based compensation costs |  |  |  |  |
Compensation costs related to stock-based compensation | 4,600 | 600 | 8,900 | 3,600 |
Accrued salaries and wages | 10,500 |  | 10,500 |  | 5,600
Total compensation cost related to nonvested awards not yet recognized | 6,700 |  | $ 6,700 |  |
Period for recognition of unrecognized compensation cost |  |  | 2 years 5 months 9 days |  |
Amounts paid on cash settled awards | 100 | 100 | $ 3,600 | 4,500 |
Phantom Share Units (PSUs) | Minimum |  |  |  |  |
Stock-based compensation costs |  |  |  |  |
Vesting period |  |  | 3 years |  |
Phantom Share Units (PSUs) | Maximum |  |  |  |  |
Stock-based compensation costs |  |  |  |  |
Vesting period |  |  | 4 years |  |
Stock appreciation rights (SARs) |  |  |  |  |
Stock-based compensation costs |  |  |  |  |
Vesting period |  |  | 4 years |  |
Compensation costs related to stock-based compensation | 4,600 | (500) | $ 8,600 | 1,400 |
Accrued salaries and wages | 13,700 |  | 13,700 |  | $ 7,300
Total compensation cost related to nonvested awards not yet recognized | 12,800 |  | $ 12,800 |  |
Period for recognition of unrecognized compensation cost |  |  | 2 years 9 months 26 days |  |
Amounts paid on cash settled awards | $ 1,500 | $ 1,100 | $ 2,600 | $ 1,500 |

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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://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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