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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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Represents the time period of historical volatility of stock used to estimate expected volatility, in periods.

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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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.

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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.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Net number of share options (or share units) granted during the period.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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