Segment Information (Schedule of Segment Reporting Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 segments	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Number of Reportable Segments	2
Identifiable assets	$ 1,426,377	$ 1,324,257	$ 1,229,623
Revenues	239,034	229,670
Operating Costs	154,090	149,605
Drilling Services Revenue	117,957	133,074
Drilling Services Costs and Expenses	76,338	88,986
Production Services Revenue	121,077	96,596
Production Services Costs and Expenses	77,752	60,619
Segment Margin	84,944	80,065
Depreciation and amortization	45,526	46,285
Capital Expenditures	36,917	42,050
Drilling Services Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	780,786	870,291
Segment Margin	41,619	44,088
Depreciation and amortization	29,239	30,046
Capital Expenditures	21,256	27,796
Production Services Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	403,923	430,829
Segment Margin	43,325	35,977
Depreciation and amortization	16,019	15,987
Capital Expenditures	15,343	13,873
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	241,668	23,137
Revenues	0	0
Operating Costs	0	0
Segment Margin	0	0
Depreciation and amortization	268	252
Capital Expenditures	$ 318	$ 381