Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accrued Liabilities Detail [Table]
Compensation and employee benefits	$ 15,221	$ 15,248
Oil and gas producing liabilities	2,473	2,740
Unearned income	11,496	8,130
Deferred tax liability	2,177	2,388
Other accrued liabilities	33,650	44,748
Accrued liabilities	$ 65,017	$ 73,254