Quarterly report pursuant to Section 13 or 15(d)

Investments - Additional Information (Details)

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Investments - Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Investments All Other Investments [Abstract]      
Long-term restricted investments $ 9,888   $ 5,922
Purchases of restricted and other investments $ 3,966 $ 0