Schedule of Debt Maturities (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Amended 2010 Credit Agreement [Member]	Dec. 31, 2012 February 2011 Amended US Term Loan [Member]	Dec. 31, 2011 February 2011 Amended US Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument Ebitda Cushion On Consolidated Leverage Ratio	$ 133,600,000
2013		0
2014		0
2015		10,100,000
2016		11,800,000
2017		1,109,200,000
Total		$ 1,131,100,000	$ 1,156,100,000