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Stock-Based Compensation (Details 3) (USD $)	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	$ 10,700,000us-gaap_AllocatedShareBasedCompensationExpense	$ 22,800,000us-gaap_AllocatedShareBasedCompensationExpense	$ 28,600,000us-gaap_AllocatedShareBasedCompensationExpense
Total compensation cost related to nonvested awards not yet recognized	10,900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	20,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Accrued salaries and wages	84,034,000us-gaap_EmployeeRelatedLiabilitiesCurrent	86,498,000us-gaap_EmployeeRelatedLiabilitiesCurrent
Maximum
Stock-based compensation costs
Vesting period	5 years
Restricted Stock
Stock-based compensation
Outstanding at the beginning of the period (in shares)	291,811us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Released (in shares)	(126,292)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Canceled (in shares)	(33,022)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Outstanding at the end of the period (in shares)	132,497us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Stock-based compensation costs
Total compensation cost related to nonvested awards not yet recognized	3,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	6,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Employee stock options
Stock-based compensation costs
Total compensation cost related to nonvested awards not yet recognized	7,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	13,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Phantom Share Units (PSUs)
Stock-based compensation costs
Compensation costs related to stock-based compensation, pre-tax	8,300,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember	11,900,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember	5,900,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
Total compensation cost related to nonvested awards not yet recognized	25,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
Period for recognition of unrecognized compensation cost	2 years 5 months 1 day
Accrued salaries and wages	8,200,000us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember	6,800,000us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
Amounts paid on cash settled awards	6,900,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember	6,600,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember	2,600,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
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	2,900,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	7,500,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	4,400,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Total compensation cost related to nonvested awards not yet recognized	5,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Period for recognition of unrecognized compensation cost	2 years 9 months 26 days
Accrued salaries and wages	6,300,000us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	11,400,000us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Vesting period	4 years
Amounts paid on cash settled awards	$ 2,200,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	$ 1,700,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	$ 200,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember

X

- 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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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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