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Debt (Term Loans Under The Senior Credit Agreement) (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 07, 2014	Apr. 24, 2013	Oct. 15, 2014	Feb. 05, 2015
Debt Instrument [Line Items]
Repayment of term loans	$ 310,500,000us-gaap_RepaymentsOfOtherLongTermDebt	$ 512,000,000us-gaap_RepaymentsOfOtherLongTermDebt	$ 10,000,000us-gaap_RepaymentsOfOtherLongTermDebt
Deferred financing fees	17,572,000us-gaap_AmortizationOfFinancingCosts	15,560,000us-gaap_AmortizationOfFinancingCosts	12,870,000us-gaap_AmortizationOfFinancingCosts
Debt instrument, principal balance	7,870,000,000us-gaap_DebtInstrumentCarryingAmount	5,910,041,000us-gaap_DebtInstrumentCarryingAmount
Repayments of revolving credit facility	790,000,000	225,000,000	484,000,000
Aggregate debt	7,860,799,000us-gaap_LongTermDebt	5,876,607,000us-gaap_LongTermDebt
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		312,000,000		180,500,000	310,700,000
Deferred financing fees				1,100,000	2,300,000
Discount related to debt				300,000	600,000
Debt instrument, principal balance		180,529,000
Aggregate debt		180,234,000
2012-1 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	200,000,000
Debt instrument, maturity date	May 09, 2017
Accrued interest on Term Loan	2.67%
Deferred financing fees	2,700,000
Repayment of term loans	12,500,000
Debt instrument, principal balance	172,500,000	185,000,000
Aggregate debt	172,500,000	185,000,000
2012-1 Term Loan [Member] \| First Eight Quarters [Member]
Debt Instrument [Line Items]
Quarterly payments	2,500,000
2012-1 Term Loan [Member] \| Next Four Quarters [Member]
Debt Instrument [Line Items]
Quarterly payments	3,750,000
2012-1 Term Loan [Member] \| Each Quarter Thereafter [Member]
Debt Instrument [Line Items]
Quarterly payments	5,000,000
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		190,000,000		110,000,000	189,300,000
Deferred financing fees				1,000,000	2,000,000
Discount related to debt				200,000	400,000
Debt instrument, principal balance		109,971,000
Aggregate debt		109,745,000
2014 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	1,500,000,000
Debt instrument, maturity date	Mar. 24, 2021
Accrued interest on Term Loan	3.25%
Percentage of par value price for issuance of term loan	99.75%
Deferred financing fees	12,900,000
Quarterly payments	3,750,000
Repayment of term loans	7,500,000
Debt instrument, principal balance	1,492,500,000
Aggregate debt	1,489,149,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	May 09, 2017
Debt instrument, principal balance	125,000,000	215,000,000
Repayments of revolving credit facility	790,000,000			390,000,000		300,000,000
Aggregate debt	$ 125,000,000	$ 215,000,000
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%
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%
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%
Minimum [Member] \| Eurodollar [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate							1.375%
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%
Maximum [Member] \| Eurodollar [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate							2.00%