Quarterly report pursuant to Section 13 or 15(d)

Schedule of fair value of equity method investments (Details)

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Schedule of fair value of equity method investments (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 3 Months Ended
Mar. 05, 2013
Mar. 31, 2013
Mar. 31, 2012
Schedule Of Fair Value Of Equity Method Investments Details      
Investments in equity method investees at fair value       
Contributions to equity method investees 250,000 109,588   
Distributions of earnings from equity method investees   (1,344)   
Distributions of capital from equity method investees   (6,625)   
Change in fair value of investments in equity method investees   969   
Investments in equity method investees at fair value   $ 102,588