Fair Value Measurements - Reconciliations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2009
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Discount rate		20.00%
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Available-for-sale securities, end of period		$ 27,679
Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value analysis, reduction in estimated cash flows		0.00%
Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value analysis, reduction in estimated cash flows		10.00%
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Available-for-sale securities, end of period	13,973	27,679
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other than temporary impairment loss on investments			2,400
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Available-for-sale securities, beginning of period	11,123	11,829
Redemption of TIF bonds	(11,002)	0
Reclassification adjustment AOCI	0	1,542
Transfer out of Level 3	(121)	(2,248)
Available-for-sale securities, end of period	0	11,123
Privately-held debt and equity securities, beginning of period	2,475	2,475
Net settlement	(4,875)	0
Realized gain recorded in earnings	2,400	0
Privately held debt and equity securities, end of period	$ 0	$ 2,475