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Stock-Based Compensation (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-based compensation costs
Compensation costs related to stock-based compensation, pre-tax	$ 10,700	$ 22,800	$ 28,600
Total compensation cost related to nonvested awards not yet recognized	10,900	20,000
Accrued salaries and wages	$ 84,034	$ 86,564
Maximum
Stock-based compensation costs
Vesting period	5 years
Restricted Stock
Stock-based compensation
Outstanding at the beginning of the period (in shares)	291,811
Released (in shares)	(126,292)
Canceled (in shares)	(33,022)
Outstanding at the end of the period (in shares)	132,497	291,811
Stock-based compensation costs
Total compensation cost related to nonvested awards not yet recognized	$ 3,600	$ 6,800
Employee stock options
Stock-based compensation costs
Total compensation cost related to nonvested awards not yet recognized	7,300	13,200
Phantom Share Units (PSUs)
Stock-based compensation costs
Compensation costs related to stock-based compensation, pre-tax	8,300	11,900	5,900
Total compensation cost related to nonvested awards not yet recognized	$ 25,400
Period for recognition of unrecognized compensation cost	2 years 5 months 1 day
Accrued salaries and wages	$ 8,200	6,800
Amounts paid on cash settled awards	$ 6,900	6,600	2,600
Phantom Share Units (PSUs) | Minimum
Stock-based compensation costs
Vesting period	3 years
Phantom Share Units (PSUs) | Maximum
Stock-based compensation costs
Vesting period	5 years
Stock appreciation rights (SARs)
Stock-based compensation costs
Compensation costs related to stock-based compensation, pre-tax	$ 2,900	7,500	4,400
Total compensation cost related to nonvested awards not yet recognized	$ 5,700
Period for recognition of unrecognized compensation cost	2 years 9 months 26 days
Accrued salaries and wages	$ 6,300	11,400
Vesting period	4 years
Amounts paid on cash settled awards	$ 2,200	$ 1,700	$ 200

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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.

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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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