Derivative Instruments and Hedging Activity (Narrative) (Details) (USD $)						0 Months Ended		9 Months Ended
	Sep. 30, 2014 counterparty	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2014 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Feb. 06, 2013 New Term Loan [Member] Term Loan [Member] LIBOR [Member]	Sep. 30, 2014 Interest Rate Cap [Member] Derivative_interest_rate_cap	Sep. 30, 2014 Interest Rate Cap [Member] New Term Loan [Member] Term Loan [Member] LIBOR [Member]
Derivatives, Fair Value [Line Items]
Number of interest rate derivatives held with one counterparty							8
Number of counterparties associated with interest rate derivatives held	2
Notional amount							$ 750,000,000
Fixed interest rate							1.00%
Debt, variable rate floor						1.00%		1.00%
Weighted average fixed interest rate							4.80%
Percent of coverage							36.00%
Number of outstanding interest rate caps							8
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	5,847,000
Accumulated other comprehensive income (loss), before tax	3,488,000	1,189,000	2,935,000	0	3,488,000
Accumulated other comprehensive loss	$ 2,232,000	$ 799,000			$ 2,232,000