Investment in Savoy (Condensed Balance Sheet - Savoy) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets	$ 107,135	$ 39,361
Total assets	610,957	260,413
Total liabilities	428,069	77,079
Total liabilities and stockholders' equity	610,957	260,413
Savoy [Member]
Current assets	27,247
Oil and gas properties, net	28,940
Total assets	56,187
Total liabilities	10,814
Partners' capital	45,373
Total liabilities and stockholders' equity	$ 56,187