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Stock-Based Compensation and Equity (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Redeemable Securities      
Balance- beginning of period $ 7,531 $ 7,700 $ 7,700
Redemption value adjustment 0 79 (840)
Net loss (50) (43)  
Distributions (54) (816)  
Change in other comprehensive (loss) income 23 (9)  
Balance- end of period $ 7,404 $ 6,929 $ 7,531