Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Senior Notes [Member] | 7.375% Senior Notes Due 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt interest rate (percent)	7.375%	7.375%
Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate bonds (Note 6)	$ 2,517	$ 3,541
Cash equivalents	123,784	66,782
Recurring [Member] | Estimate of Fair Value Measurement [Member] | Term Loan [Member] | 7 Year Senior Secured Term Loan Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt	1,447,084	1,063,255
Recurring [Member] | Estimate of Fair Value Measurement [Member] | Senior Notes [Member] | 7.375% Senior Notes Due 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt	529,200	507,150
Derivative instruments - Interest rate caps (Note 16)	2,090	1,189
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate bonds (Note 6)	0	0
Cash equivalents	123,784	66,782
Recurring [Member] | Level 1 [Member] | Term Loan [Member] | 7 Year Senior Secured Term Loan Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt	0	0
Recurring [Member] | Level 1 [Member] | Senior Notes [Member] | 7.375% Senior Notes Due 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt	0	0
Derivative instruments - Interest rate caps (Note 16)	0	0
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate bonds (Note 6)	2,517	3,541
Cash equivalents	0	0
Recurring [Member] | Level 2 [Member] | Term Loan [Member] | 7 Year Senior Secured Term Loan Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt	1,447,084	1,063,255
Recurring [Member] | Level 2 [Member] | Senior Notes [Member] | 7.375% Senior Notes Due 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt	529,200	507,150
Derivative instruments - Interest rate caps (Note 16)	2,090	1,189
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate bonds (Note 6)	0	0
Cash equivalents	0	0
Recurring [Member] | Level 3 [Member] | Term Loan [Member] | 7 Year Senior Secured Term Loan Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt	0	0
Recurring [Member] | Level 3 [Member] | Senior Notes [Member] | 7.375% Senior Notes Due 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt	0	0
Derivative instruments - Interest rate caps (Note 16)	$ 0	$ 0