Segment Information (Schedule of Segment Reporting Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Identifiable assets	$ 1,324,257	$ 1,199,084	$ 1,339,776
Drilling services, revenues	133,074	124,304
Production services, revenues	96,596	107,674
Total revenues	229,670	231,978
Drilling services, operating costs	88,986	81,077
Production services, operating costs	60,465	60,696
Operating costs	149,451	141,773
Segment margin	80,219	90,205
Depreciation and amortization	46,285	38,373
Capital expenditures	42,050	112,377
Drilling Services Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	870,291	745,072
Segment margin	44,088	43,227
Depreciation and amortization	30,046	25,489
Capital expenditures	27,796	80,584
Production Services Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	430,829	418,934
Segment margin	36,131	46,978
Depreciation and amortization	15,987	12,718
Capital expenditures	13,873	31,554
Corporate [Member]
Segment Reporting Information [Line Items]
Identifiable assets	23,137	35,078
Segment margin	0	0
Depreciation and amortization	252	166
Capital expenditures	$ 381	$ 239