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Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Stock-based compensation costs |  |  |  |  |
Compensation benefit related to stock-based compensation, pre tax | $ 1,600 | $ 2,300 | $ 3,100 | $ 4,400 |
Time period of historical volatility of stock used to estimate expected volatility |  |  | 5 years 4 months 24 days |  |
Dividend yield (as a percent) |  |  | 0.00% |  |
Granted (in shares) |  |  | 1,561,035 |  |
Accrued salaries and wages | 80,744 |  | $ 80,744 |  | $ 98,671
Stock based compensation benefit |  |  | $ 4,375 | $ 8,036 |
Weighted-average assumptions used in the Black-Scholes option-pricing model |  |  |  |  |
Risk-free interest rate (as a percent) |  |  | 1.20% | 1.53% |
Expected volatility (as a percent) |  |  | 31.22% | 36.86% |
Dividend yield (as a percent) |  |  | 0.00% |  |
Weighted-average expected life |  |  | 5 years 4 months 24 days | 5 years 5 months 12 days |
Phantom Share Units (PSUs) |  |  |  |  |
Stock-based compensation costs |  |  |  |  |
Accrued salaries and wages | 6,200 |  | $ 6,200 |  | 7,800
Total compensation cost related to nonvested awards not yet recognized | 12,000 |  | $ 12,000 |  |
Period for recognition of unrecognized compensation cost |  |  | 1 year 6 months 26 days |  |
Stock based compensation expense | 600 | 5,000 | $ 3,600 | $ 9,500 |
Amounts paid on cash settled awards | 100 | 100 | $ 4,500 | 5,300 |
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 |  |
Accrued salaries and wages | 7,700 |  | $ 7,700 |  | $ 8,000
Total compensation cost related to nonvested awards not yet recognized | 5,800 |  | $ 5,800 |  |
Period for recognition of unrecognized compensation cost |  |  | 2 years 10 months 21 days |  |
Stock based compensation benefit | 500 |  |  |  |
Stock based compensation expense |  | 2,500 | $ 1,400 | 7,100 |
Amounts paid on cash settled awards | $ 1,100 | $ 500 | $ 1,500 | $ 2,300 |

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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -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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