Subsequent Event (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended		3 Months Ended
	Apr. 25, 2012 Line of Credit [Member]	May 18, 2010 Senior Credit Facility [Member] Line of Credit [Member] Y	Mar. 31, 2012 Senior Term Loan, Due 2017 [Member] Term Loan [Member]	Apr. 25, 2012 Senior Term Loan, Due 2017 [Member] Term Loan [Member]	Mar. 31, 2012 Amended Senior Credit Facility [Member] Line of Credit [Member]	Apr. 25, 2012 Amended Senior Credit Facility [Member] Line of Credit [Member] Y	Apr. 25, 2012 Amended Revolver [Member] Revolving Line of Credit [Member]
Subsequent Event [Line Items]
Number of years to maturity, senior credit facility (in years)		5				5
Maximum borrowing capacity of line of credit facility		$ 200,000		$ 75,000		$ 375,000	$ 300,000
Amount of expansion option to increase the aggregate principal amount of the Term loan or Revolving Credit Facility	$ 150,000
Duration of time extension under the terms of the Restated Credit Facility					2 years
Initial percentage of Term Loan payable quarterly due to Restated Credit Facility				5.00%
Initial duration of quarterly payments on Term Loan under the terms of the Restated Credit Facility			3 years
Final percentage of Term Loan payable quarterly due to Restated Credit Facility				10.00%
Final duration of quarterly payments on Term Loan under the terms of the Restated Credit Facility			2 years
Maximum net debt to EBITDA ratio used as a significant financial covenant for the Restated Credit Facility						3.25
Minimum interest coverage to EBITDA ratio used as a significant financial covenant for the Restated Credit Facility						3