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Fair Value Measurement, Level 3 inputs (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Redeemable Noncontrolling Interests (Temporary Equity) [Member]
Mar. 31, 2013
Redeemable Noncontrolling Interests (Temporary Equity) [Member]
Redeemable Noncontrolling Interests [Roll Forward]        
Beginning period balance $ 131,670 $ 133,000 $ 133,000 $ 136,500
Dividends paid to noncontrolling interest     (5,250)  
Net income and fair value adjustment     3,920 4,505
End period balance $ 131,670 $ 133,000 $ 131,670 $ 141,005