Fair Value Measurements (Details 2) (Recurring, Derivative Liabilities, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 0	$ (56,229)
Included in other comprehensive income	0	4,800
Settlements	0	50,757
Balance at end of period	0	0
Other Income (Expense)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Included in other income (expense) and interest expense	0	599
Interest Expense
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Included in other income (expense) and interest expense	$ 0	$ 73