Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended					9 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Level 1 [Member]	Dec. 31, 2012 Level 1 [Member]	Sep. 30, 2013 Recurring [Member]	Sep. 30, 2013 Recurring [Member] Level 1 [Member]	Sep. 30, 2012 Recurring [Member] Level 1 [Member]	Sep. 30, 2013 Recurring [Member] Level 1 [Member]	Sep. 30, 2012 Recurring [Member] Level 1 [Member]	Sep. 30, 2013 Recurring [Member] Level 2 [Member]	Sep. 30, 2013 Recurring [Member] Level 3 [Member]	Sep. 30, 2013 Recurring [Member] Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes payable (in hundredths)					98.50%	107.88%
Proceeds from sale of equity investment		$ 1,785	$ 0					$ 1,785
Realized gain (loss)								135	(76)	(366)	982
Realized loss on bankruptcy	(10)
Current and Non-Current Investments [Abstract]
Balance, beginning of period										56
Unrealized gain (loss)										19
Realized gain (loss)										135
Level inputs transfer							0	1,575		1,575		(1,575)	0	0
Sale of investment							(1,785)			(1,785)		0		0
Balance, end of period								0		0
Balance, beginning of period												2,016
Unrealized gain (loss)												(441)
Realized gain (loss)												0
Balance, end of period												0
Balance, beginning of period														553
Unrealized gain (loss)														0
Realized gain (loss)													(12)	(100)
Balance, end of period													453	453
Balance, beginning of period							2,625
Unrealized gain (loss)							(422)
Realized gain (loss)							35
Balance, end of period							453
Components of accumulated other comprehensive income [Abstract]
Cumulative translation adjustment	1,745	1,745		1,965
Unrealized loss on available-for-sale security, net of tax	0	0		(398)
Accumulated other comprehensive income	$ 1,745	$ 1,745		$ 1,567