Fair Value Fair Value (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	$ 933,600,000
Fair Value	972,858,000	[1]	973,844,000	[1]
Long-term debt	917,215,000		918,122,000
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term interest rate swap liability	0	[2]
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term interest rate swap liability	1,502,000	[2]
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term interest rate swap liability	0	[2]
Term Loan, due 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	617,215,000	[3]	618,122,000	[3]
Fair Value	652,608,000	[1],[3]	655,844,000	[1],[3]
Unamortized Discount	16,385,000	[4]	17,078,000	[4]
Senior Secured Notes due 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	300,000,000		300,000,000
Fair Value	$ 320,250,000	[1]	$ 318,000,000	[1]

[1] The Company estimated fair value based on market prices of the Company's debt securities at the balance sheet date, which falls within Level 2 of the fair value hierarchy.

[2] The fair value is determined using valuation models which rely on the expected LIBOR based yield curve and estimates of counterparty and the Company’s non-performance risk. Because each of these inputs are directly observable or can be corroborated by observable market data, we have categorized these interest rate swaps as Level 2 within the fair value hierarchy.

[3] The carrying amount of the New Term Loan is net of the unamortized discount of $16.4 million and $17.1 million as of March 31, 2014 and December 31, 2013, respectively.

[4] The $16.4 million and $17.1 million discount on the New Term Loan (as defined below) as of March 31, 2014 and December 31, 2013, respectively, is being amortized using the effective interest method over the term of the senior secured credit facility due 2019.