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

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer.

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Debt (Term Loans Under The Senior Credit Agreement) (Narrative) (Details) - USD ($)				12 Months Ended
	Jan. 20, 2017	Nov. 18, 2015	Feb. 07, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Repayment of term loans				$ 20,000,000	$ 190,000,000	$ 310,500,000
Debt instrument, principal balance				8,875,000,000	8,555,000,000
2011 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 500,000,000
Debt instrument, maturity date				Jun. 30, 2018
Term Loan, percentage of par value				99.75%
Deferred financing fees				$ 4,900,000
Repayment of term loans			$ 180,500,000				$ 312,000,000
Write-off of deferred financing fees			1,100,000
Discount related to debt			300,000
2012-1 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 200,000,000
Debt instrument, maturity date				May 09, 2017
Deferred financing fees				$ 2,700,000
Repayment of term loans		$ 160,000,000			172,500,000
Write-off of deferred financing fees		$ 800,000
2012-2 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 300,000,000
Debt instrument, maturity date				Sep. 28, 2019
Percentage of par value price for issuance of term loan				99.75%
Deferred financing fees				$ 3,500,000
Repayment of term loans			110,000,000				$ 190,000,000
Write-off of deferred financing fees			1,000,000
Discount related to debt			$ 200,000
2014 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 1,500,000,000
Debt instrument, maturity date				Mar. 24, 2021
Percentage of par value price for issuance of term loan				99.75%
Deferred financing fees				$ 12,900,000
Quarterly payments				3,800,000
Repayment of term loans				15,000,000
Debt instrument, principal balance				1,462,500,000	1,477,500,000
2015 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 500,000,000
Debt instrument, maturity date				Jun. 10, 2022
Term Loan, percentage of par value				99.00%
Coupon rate of notes				3.27%
Deferred financing fees				$ 5,100,000
Quarterly payments				1,300,000
Repayment of term loans				5,000,000
Debt instrument, principal balance				$ 492,500,000	$ 497,500,000
Base Rate [Member] \| 2011 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate				1.75%
Base rate floor				2.00%
Base Rate [Member] \| 2012-2 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate				1.75%
Base rate floor				2.00%
Base Rate [Member] \| 2014 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate				1.50%
Base rate floor				1.75%
Base Rate [Member] \| 2015 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate				1.50%
Base rate floor				1.75%
Eurodollar [Member] \| 2011 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate				2.75%
Eurodollar rate floor				1.00%
Eurodollar [Member] \| 2012-2 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate				2.75%
Eurodollar rate floor				1.00%
Eurodollar [Member] \| 2014 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate				2.50%
Eurodollar rate floor				0.75%
Eurodollar [Member] \| 2015 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate				2.50%
Eurodollar rate floor				0.75%
Minimum [Member] \| Base Rate [Member] \| 2012-1 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate				1.00%
Minimum [Member] \| Eurodollar [Member] \| 2012-1 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate				2.00%
Maximum [Member] \| Base Rate [Member] \| 2012-1 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate				1.50%
Maximum [Member] \| Eurodollar [Member] \| 2012-1 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate				2.50%
Subsequent Event [Member] \| Base Rate [Member] \| Term Loan under the Senior Credit Agreement [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	1.25%
Base rate floor	0.00%
Subsequent Event [Member] \| Eurodollar [Member] \| Term Loan under the Senior Credit Agreement [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	2.25%
Eurodollar rate floor	0.00%