Fair Value Measurements: Pretax Effect from Changes in Fair Value of Liabilities (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Change in value of common stock warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Pre-tax effect resulting from changes in fair value	$ 1,577,000	$ (2,000,000)
Change in value of contingent consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Pre-tax effect resulting from changes in fair value	2,465,000	0
Interest expense and financing costs, net | Debt prepayment derivative
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Pre-tax effect resulting from changes in fair value	0.000	(240,000)
Cost of revenues | Commodities - exchange traded futures
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Pre-tax effect resulting from changes in fair value of derivatives	0	104,000
Cost of revenues | Commodities - physical forward contracts
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Pre-tax effect resulting from changes in fair value of derivatives	$ (516,000)	$ 306,000