Long-Term Debt (Senior Subordinated Notes) (Details) - USD ($)			1 Months Ended		12 Months Ended
		Apr. 20, 2010	Mar. 31, 2011	Apr. 30, 2010	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2013
Long-Term Debt [Line Items]
Repayment of long-term debt	[1]				$ 268,377,000	$ 171,432,000	$ 383,344,000
Initial purchasers' discount					3,400,000	2,300,000
Proceeds from issuance of debt	[1]				169,845,000	306,063,000	$ 448,163,000
9 7/8% Senior Subordinated Notes Due April 2017
Long-Term Debt [Line Items]
Face amount		$ 310,000,000	$ 50,000,000		$ 380,100,000
Interest rate		9.875%	9.875%		9.875%
Expenses incurred associated with offering		$ 11,900,000
Initial purchasers' discount		$ 1,900,000
Proceeds from issuance of debt			$ 48,500,000
13.5% Senior Subordinated Notes Due 2015
Long-Term Debt [Line Items]
Interest rate		13.50%
Repayment of long-term debt		$ 175,000,000
Payment of call premium		$ 5,300,000
Senior Secured Credit Facility - (Term Loan B Portion)
Long-Term Debt [Line Items]
Repayment of long-term debt				$ 74,800,000
Senior Secured Revolving Credit Facility
Long-Term Debt [Line Items]
Face amount						$ 100,000,000
Repayment of long-term debt				$ 10,000,000
Senior Subordinated Note [Member]
Long-Term Debt [Line Items]
Face amount								$ 3,800,000
Medical Developers, LLC | 9 7/8% Senior Subordinated Notes Due April 2017
Long-Term Debt [Line Items]
Face amount			$ 16,250,000
Prime Rate
Long-Term Debt [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate					3.25%	3.25%	3.25%

[1] As Restated