Acquisition (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs	$ 0	$ 0	$ 2,100,000
North Jackson Facility [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Aug. 01, 2011
Business Combination, Consideration Transferred			111,300,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			4,400,000
Escrow Deposit			2,500,000
Cash consideration from settlement of escrow	425,000
Business Acquisition, Pro Forma Effective Tax Rate			36.40%
Term loan [Member] | North Jackson Facility [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Liabilities Incurred			40,000,000
Revolving credit facility [Member] | North Jackson Facility [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Liabilities Incurred			40,000,000
Convertible notes [Member] | North Jackson Facility [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Liabilities Incurred			$ 20,000,000