Investment in Savoy (Condensed Balance Sheet - Savoy) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets	$ 42,910	$ 39,361
Total assets	264,469	260,413
Total liabilities	75,478	77,079
Total liabilities and stockholders' equity	264,469	260,413
Savoy [Member]
Current assets	31,544
Oil and gas properties, net	27,868
Total assets	59,412
Total liabilities	16,234
Partners' capital	43,178
Total liabilities and stockholders' equity	$ 59,412