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Summary of Significant Accounting Policies (Details 4) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Stock-based compensation costs |  |  |
Time period of historical volatility of stock used to estimate expected volatility | 5 years 4 months 24 days |  |
Expected dividend yield assumption (as a percent) | 0.00% |  |
Granted (in shares) | 1,535,823 |  |
Accrued salaries and wages | $ 76,451 |  | $ 98,671
Weighted-average assumptions used in the Black-Scholes option-pricing model |  |  |
Risk-free interest rate (as a percent) | 1.20% | 1.54% |
Expected volatility (as a percent) | 31.22% | 36.93% |
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 | $ 5,700 |  | 7,800
Total compensation cost related to nonvested awards not yet recognized | $ 16,400 |  |
Period for recognition of unrecognized compensation cost | 1 year 9 months 15 days |  |
Stock based compensation expense | $ 3,000 | $ 4,500 |
Amounts paid on cash settled awards | $ 4,400 | 5,200 |
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 | $ 9,100 |  | $ 8,000
Total compensation cost related to nonvested awards not yet recognized | $ 9,800 |  |
Period for recognition of unrecognized compensation cost | 3 years 22 days |  |
Stock based compensation expense | $ 1,900 | 4,600 |
Amounts paid on cash settled awards | $ 400 | $ 1,800 |

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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 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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