Long-Term Debt and Redeemable Preferred Stock (Details Textual) (USD $) In Millions, unless otherwise specified		3 Months Ended			3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011 2011 Term Loan Facility Due 2017 [Member]	Jun. 30, 2012 2011 Term Loan Facility Due 2017 [Member]	Dec. 31, 2010 2010 Term Loan Facility Due 2015 [Member]	Jun. 30, 2011 2011 Revolving Credit Facility Due 2016 [Member]	Jun. 30, 2012 2011 Revolving Credit Facility Due 2016 [Member]	Jun. 30, 2012 Senior Subordinated Term Loan Due 2014 [Member]	Dec. 31, 2011 Senior Subordinated Term Loan Due 2014 [Member]	Jun. 30, 2012 Amended and Restated Senior Subordinated Term Loan due 2014 [Member]	Apr. 30, 2012 Amended and Restated Senior Subordinated Term Loan due 2014 [Member]	Dec. 31, 2011 Amended and Restated Senior Subordinated Term Loan due 2014 [Member]
Long-Term Debt And Redeemable Preferred Stock (Textual) [Abstract]
Debt instrument, maturity term (years)		6 years 6 months			5 years
Senior Subordinated Term Loan								$ 58.4	$ 58.4
Contributed loan	48.6						48.6
Fixed Rate of Non-Contributed Loan										12.00%
Floating rate										7.00%
Interest Rate of Non-Contributed Loan										8.50%
Reduction in interest rate of Non-Contributed Loan										3.50%
Prepayment Premium										2.00%
Aggregate principal amount outstanding		800.0	792.0	794.0			107.0
Maximum borrowings available under credit facility					140.0	140.0
Letters of credit outstanding						10.3
Availability under the credit facility						$ 125.5
Discount rate over domestic treasuries										0.75%
LIBOR floor										1.50%