Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accrued Liabilities Detail [Table]
Compensation and employee benefits	$ 20,711	$ 15,221
Oil and gas producing liabilities	14,988	2,473
Unearned income	11,280	11,496
Deferred tax liability	1,181	2,177
Other accrued liabilities	37,724	31,908
Accrued liabilities	$ 85,884	$ 63,275