Debt (Term Loans Under The Senior Credit Agreement) (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended			0 Months Ended	9 Months Ended		9 Months Ended		9 Months Ended			0 Months Ended	3 Months Ended	9 Months Ended		0 Months Ended	9 Months Ended		0 Months Ended	3 Months Ended	9 Months Ended		0 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Feb. 07, 2014 2011 Term Loan [Member]	Sep. 30, 2014 2011 Term Loan [Member]	Dec. 31, 2013 2011 Term Loan [Member]	Sep. 30, 2014 2012-1 Term Loan [Member]	Dec. 31, 2013 2012-1 Term Loan [Member]	Sep. 30, 2014 2012-1 Term Loan [Member] First Eight Quarters [Member]	Sep. 30, 2014 2012-1 Term Loan [Member] Next Four Quarters [Member]	Sep. 30, 2014 2012-1 Term Loan [Member] Each Quarter Thereafter [Member]	Feb. 07, 2014 2012-2 Term Loan [Member]	Sep. 30, 2014 2012-2 Term Loan [Member]	Sep. 30, 2014 2012-2 Term Loan [Member]	Dec. 31, 2013 2012-2 Term Loan [Member]	Feb. 07, 2014 2014 Term Loan [Member]	Sep. 30, 2014 2014 Term Loan [Member]	Dec. 31, 2013 2014 Term Loan [Member]	Feb. 07, 2014 Revolving Credit Facility [Member]	Sep. 30, 2014 Revolving Credit Facility [Member]	Sep. 30, 2014 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Feb. 07, 2014 Base Rate [Member] 2014 Term Loan [Member]	Feb. 07, 2014 Eurodollar [Member] 2014 Term Loan [Member]	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Minimum [Member] Base Rate [Member]	Sep. 30, 2014 Minimum [Member] Base Rate [Member] 2012-1 Term Loan [Member]	Sep. 30, 2014 Minimum [Member] Eurodollar [Member]	Sep. 30, 2014 Minimum [Member] Eurodollar [Member] 2012-1 Term Loan [Member]	Sep. 30, 2014 Maximum [Member]	Sep. 30, 2014 Maximum [Member] Base Rate [Member]	Sep. 30, 2014 Maximum [Member] Base Rate [Member] 2012-1 Term Loan [Member]	Sep. 30, 2014 Maximum [Member] Eurodollar [Member]	Sep. 30, 2014 Maximum [Member] Eurodollar [Member] 2012-1 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount									$ 200,000,000									$ 1,500,000,000
Debt instrument, maturity date							Jun. 30, 2018		May 09, 2017							Sep. 28, 2019		Mar. 24, 2021	Mar. 24, 2021				May 09, 2017
Basis spread on variable interest rate																									1.50%	2.50%	1.875%	0.875%	1.00%	1.875%	2.00%	2.375%	1.375%	1.50%	2.375%	2.50%
Base rate floor																									1.75%
Eurodollar rate floor																										0.75%
Term Loan, percentage of par value																		99.75%
Coupon rate of notes									2.66%										3.25%
Deferred financing fees									2,700,000									12,900,000
Quarterly payments											2,500,000	3,750,000	5,000,000						3,750,000
Repayment of term loans			303,000,000	509,500,000		180,500,000			8,800,000					110,000,000	3,800,000
Amortized deferred financing fees	4,599,000	3,981,000	13,114,000	11,508,000		1,100,000								1,000,000
Write off of discount related to debt						300,000								200,000
Aggregate debt	7,550,088,000		7,550,088,000		5,876,607,000			180,234,000	176,250,000	185,000,000							109,745,000		1,492,778,000			300,000,000	300,000,000	215,000,000
Repayments of revolving credit facility			$ 490,000,000	$ 225,000,000																	$ 390,000,000	$ 100,000,000	$ 490,000,000