Date when the Credit Facility is scheduled to expire, in CCYY-MM-DD format.

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

The average effective interest rate during the reporting period.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

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No definition available.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The effective interest rate at the end of the reporting period.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.

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Weighted average interest rate of long-term debt outstanding.

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No definition available.

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Debt Obligations (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014	Oct. 30, 2014	Apr. 09, 2014
Debt Instrument [Line Items]
Term Loan A	$ 68,437	$ 68,437	$ 72,187
Revolving Credit Facility, Interest Rate at Period End	3.23%	3.23%
Term Loan A, Weighted Average Interest Rate	1.57%	1.57%
Debt Instrument, Face Amount				$ 402,500
Debt Instrument, Convertible, Conversion Price				$ 72.18
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 66,100	$ 66,100
Amortization of Debt Discount (Premium)		7,371
Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.375%
Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.375%
Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.375%
Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.375%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600,000	600,000
Term Loan A [Member]
Debt Instrument [Line Items]
Term Loan A					$ 75,000
Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 675,000	$ 675,000
Credit Facility Expiration Date		Apr. 09, 2019
1.5% Issue [Member]
Debt Instrument [Line Items]
Debt Issuance Cost		$ 10,700
Debt Instrument, Interest Rate, Stated Percentage	1.50%	1.50%
Interest Expense, Debt	$ 1,500	$ 4,500
Amortization of Debt Discount (Premium)	$ 2,500	$ 7,400
Debt Instrument, Interest Rate During Period	4.70%	4.70%
Debt Instrument, Unamortized Discount	$ 57,100	$ 57,100