Investments in Unconsolidated Affiliates (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Assets:
Current assets	$ 58,738		$ 58,738
Noncurrent assets	161,150		161,150
Total assets	219,888		219,888
Liabilities:
Current liabilities	44,819		44,819
Noncurrent liabilities	88,957		88,957
Total liabilities	133,776		133,776
Results of operations:
Revenue	50,927	55,828	105,575	124,770
Net loss	$ 9,591	$ 5,217	$ (4,036)	$ (2,519)