Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 28, 2012
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%	7.375%
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate bonds	$ 0	$ 3,541
Cash equivalents	20,000	66,782
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	1,405,275	1,063,255
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	520,625	507,150
Derivative instruments - Interest rate caps	3,488	1,189
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate bonds	0	0
Cash equivalents	20,000	66,782
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
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	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate bonds	0	3,541
Cash equivalents	0	0
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	1,405,275	1,063,255
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	520,625	507,150
Derivative instruments - Interest rate caps	3,488	1,189
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate bonds	0	0
Cash equivalents	0	0
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
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	$ 0	$ 0