Indebtedness (Details)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2013 6.0% Senior notes due 2013 USD ($)	Dec. 31, 2012 6.0% Senior notes due 2013 USD ($)	Dec. 31, 2013 6.875% Senior notes due 2018 USD ($)	Dec. 31, 2012 6.875% Senior notes due 2018 USD ($)	Dec. 31, 2013 Note payable to Fumedica USD ($)	Dec. 31, 2012 Note payable to Fumedica USD ($)	Dec. 31, 2006 Note payable to Fumedica CHF	Dec. 31, 2013 Financing arrangements USD ($)	Dec. 31, 2012 Financing arrangements USD ($)
Current portion:
Current portion of notes payable			$ 0	$ 450,000,000			$ 3,500,000	$ 3,400,000
Current portion of credit facility	0	0
Current portion of notes payable and line of credit	3,494,000	453,379,000
Non-current portion:
Non-current notes payable	567,900,000				580,100,000	586,400,000	12,300,000	14,500,000	61,400,000
Construction cost incurred not yet paid										0	86,500,000
Non-current portion of notes payable and other financing arrangements	$ 592,433,000	$ 687,396,000