Segment Information (Schedule of Segment Reporting Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 segments	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Number of Reportable Segments			2
Identifiable assets	$ 1,264,757	$ 1,251,601	$ 1,264,757	$ 1,251,601	$ 1,229,623
Revenues	273,267	243,979	772,113	722,003
Operating Costs	179,098	161,465	499,455	470,814
Drilling Services Revenue	128,117	131,033	373,627	402,357
Drilling Services Costs and Expenses	88,848	89,350	248,948	267,630
Production Services Revenue	145,150	112,946	398,486	319,646
Production Services Costs and Expenses	90,250	72,115	250,507	203,184
Segment Margin	94,169	82,514	272,658	251,189
Depreciation and amortization	46,081	47,414	137,398	141,047
Capital Expenditures	52,665	27,435	130,578	102,145
Drilling Services Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	789,103	818,161	789,103	818,161
Segment Margin	39,269	41,683	124,679	134,727
Depreciation and amortization	28,728	30,993	86,936	92,080
Capital Expenditures	36,249	17,417	76,888	64,761
Production Services Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	411,777	401,609	411,777	401,609
Segment Margin	54,900	40,831	147,979	116,462
Depreciation and amortization	16,993	16,127	49,478	48,139
Capital Expenditures	16,265	9,661	53,094	35,895
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	63,877	31,831	63,877	31,831
Revenues	0	0	0	0
Operating Costs	0	0	0	0
Segment Margin	0	0	0	0
Depreciation and amortization	360	294	984	828
Capital Expenditures	$ 151	$ 357	$ 596	$ 1,489