Segment Information (Schedule of Segment Reporting Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 segments	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Number of Reportable Segments			2
Identifiable assets	$ 1,251,431	$ 1,291,533	$ 1,251,431	$ 1,291,533	$ 1,229,623
Revenues	259,812	248,354	498,846	478,024
Operating Costs	166,267	159,744	320,357	309,349
Drilling Services Revenue	127,553	138,250	245,510	271,324
Drilling Services Costs and Expenses	83,762	89,294	160,100	178,280
Production Services Revenue	132,259	110,104	253,336	206,700
Production Services Costs and Expenses	82,505	70,450	160,257	131,069
Segment Margin	93,545	88,610	178,489	168,675
Depreciation and amortization	45,791	47,348	91,317	93,633
Capital Expenditures	40,996	32,660	77,913	74,710
Drilling Services Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	778,148	849,649	778,148	849,649
Segment Margin	43,791	48,956	85,410	93,044
Depreciation and amortization	28,969	31,041	58,208	61,087
Capital Expenditures	19,383	19,548	40,639	47,344
Production Services Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	413,308	414,729	413,308	414,729
Segment Margin	49,754	39,654	93,079	75,631
Depreciation and amortization	16,466	16,025	32,485	32,012
Capital Expenditures	21,486	12,361	36,829	26,234
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	59,975	27,155	59,975	27,155
Revenues	0	0	0	0
Operating Costs	0	0	0	0
Segment Margin	0	0	0	0
Depreciation and amortization	356	282	624	534
Capital Expenditures	$ 127	$ 751	$ 445	$ 1,132