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Debt (Details) (USD $)
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3 Months Ended | 9 Months Ended | 0 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 1 Months Ended | 1 Months Ended | 9 Months Ended | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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Jul. 02, 2012
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Jul. 02, 2012
Term Loan Facility [Member]
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Sep. 30, 2014
Term Loan Facility [Member]
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Jul. 02, 2012
Revolving Credit Facility [Member]
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Sep. 30, 2014
Secured Debt [Member]
Term Loan Facility [Member]
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Dec. 31, 2013
Secured Debt [Member]
Term Loan Facility [Member]
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Mar. 31, 2014
Secured Debt [Member]
Revolving Credit Facility [Member]
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Sep. 30, 2014
Secured Debt [Member]
Revolving Credit Facility [Member]
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Dec. 31, 2013
Secured Debt [Member]
Revolving Credit Facility [Member]
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Sep. 30, 2014
4.75% Senior Notes [Member]
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Mar. 31, 2014
4.75% Senior Notes [Member]
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Sep. 30, 2014
4.75% Senior Notes [Member]
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Sep. 30, 2014
4.75% Senior Notes [Member]
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Dec. 31, 2013
4.75% Senior Notes [Member]
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Sep. 30, 2014
Federal Funds Rate [Member]
Secured Debt [Member]
Term Loan Facility [Member]
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Sep. 30, 2014
Federal Funds Rate [Member]
Secured Debt [Member]
Revolving Credit Facility [Member]
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Sep. 30, 2014
LIBOR [Member]
Secured Debt [Member]
Term Loan Facility [Member]
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Sep. 30, 2014
LIBOR [Member]
Secured Debt [Member]
Revolving Credit Facility [Member]
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Sep. 30, 2014
Base Rate [Member]
Secured Debt [Member]
Term Loan Facility [Member]
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Sep. 30, 2014
Base Rate [Member]
Secured Debt [Member]
Revolving Credit Facility [Member]
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Jul. 31, 2014
Amended Credit Agreement [Member]
Term Loan Facility [Member]
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Sep. 30, 2014
Amended Credit Agreement [Member]
Term Loan Facility [Member]
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Mar. 31, 2014
Amended Credit Agreement [Member]
Revolving Credit Facility [Member]
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Sep. 30, 2014
Amended Credit Agreement [Member]
Revolving Credit Facility [Member]
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Sep. 30, 2014
Debt Instrument, Redemption, Period One [Member]
4.75% Senior Notes [Member]
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Sep. 30, 2014
Debt Instrument, Redemption, Period One [Member]
Minimum [Member]
4.75% Senior Notes [Member]
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Sep. 30, 2014
Debt Instrument, Redemption, Period One [Member]
Maximum [Member]
4.75% Senior Notes [Member]
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Sep. 30, 2014
Financial guarantee [Member]
4.75% Senior Notes [Member]
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| Long-term Debt, by Category, Current and Noncurrent [Abstract] | |||||||||||||||||||||||||||||||||
| Long-term debt | $ 962,500,000 | $ 944,122,000 | $ 965,363,000 | $ 0 | $ 300,000,000 | $ 493,080,000 | $ 493,080,000 | $ 493,080,000 | $ 0 | $ 962,500,000 | |||||||||||||||||||||||
| Less current maturities | (75,000,000) | (75,000,000) | (50,000,000) | ||||||||||||||||||||||||||||||
| Long-term debt | 1,362,202,000 | 1,362,202,000 | 1,215,363,000 | ||||||||||||||||||||||||||||||
| Debt amount | 1,800,000,000.0 | 1,000,000,000 | 800,000,000 | 500,000,000 | |||||||||||||||||||||||||||||
| Stated interest rate | 4.75% | ||||||||||||||||||||||||||||||||
| Interest Expense, Debt | 12,100,000 | ||||||||||||||||||||||||||||||||
| Proceeds from issuance of debt | 492,500,000 | ||||||||||||||||||||||||||||||||
| Debt discount | 7,500,000 | ||||||||||||||||||||||||||||||||
| Debt issuance cost paid | 2,000,000 | ||||||||||||||||||||||||||||||||
| Repayments of Long-term Lines of Credit | 300,000,000 | 12,500,000 | 300,000,000 | ||||||||||||||||||||||||||||||
| Amortization of financing costs and debt discounts | 300,000 | 700,000 | |||||||||||||||||||||||||||||||
| Trigger amount for redemption of debt | 175,000,000 | ||||||||||||||||||||||||||||||||
| Redemption period | 30 days | 60 days | |||||||||||||||||||||||||||||||
| Redemption price, percentage of principle amount redeemable | 100.00% | ||||||||||||||||||||||||||||||||
| Change of control triggering event redemption price, percentage | 101.00% | ||||||||||||||||||||||||||||||||
| Percentage of aggregate amount of debt required to make note due and payable immediately | 25.00% | ||||||||||||||||||||||||||||||||
| Term of long-term debt | 5 years | 5 years | |||||||||||||||||||||||||||||||
| Line of credit, remaining borrowing capacity | 800,000,000 | ||||||||||||||||||||||||||||||||
| Amortization related to financing costs and debt discounts | $ 2,100,000 | $ 2,100,000 | $ 6,400,000 | $ 7,000,000 | |||||||||||||||||||||||||||||
| Initial applicable margin for borrowings | 0.50% | 0.50% | 1.00% | 1.00% | 0.50% | ||||||||||||||||||||||||||||
| Interest rate margin | 1.625% | 1.625% | 0.625% | 0.625% | |||||||||||||||||||||||||||||
| Interest rate during period | 1.81% | 1.81% | 1.81% | 1.81% | |||||||||||||||||||||||||||||