Organization and Summary of Significant Accounting Policies (Drilling Contracts) (Details) (Drilling Services Segment [Member])	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Line Items]
Drilling Rigs	62
Colombia [Member]
Accounting Policies [Line Items]
Drilling Rigs	8
Term Contract [Member] | Currently Under Drilling Contract [Member]
Accounting Policies [Line Items]
Drilling Rigs	44
Assigned Drilling Rigs, Number of Contracts Expiring in Six Months	29
Assigned Drilling Rigs, Number of Contracts Expiring in One Year	8
Assigned Drilling Rigs, Number of Contracts Expiring in Eighteen Months	2
Assigned Drilling Rigs, Number of Contracts Expiring in Two Years	3
Assigned Drilling Rigs, Number of Contracts Expiring in Four Years	2
Term Contract [Member] | Currently Under Drilling Contract [Member] | United States [Member]
Accounting Policies [Line Items]
Drilling Rigs	36
Assigned Drilling Rigs, Number of Contracts Expiring in Six Months	21
Assigned Drilling Rigs, Number of Contracts Expiring in One Year	8
Assigned Drilling Rigs, Number of Contracts Expiring in Eighteen Months	2
Assigned Drilling Rigs, Number of Contracts Expiring in Two Years	3
Assigned Drilling Rigs, Number of Contracts Expiring in Four Years	2
Term Contract [Member] | Currently Under Drilling Contract [Member] | Colombia [Member]
Accounting Policies [Line Items]
Drilling Rigs	8
Assigned Drilling Rigs, Number of Contracts Expiring in Six Months	8
Assigned Drilling Rigs, Number of Contracts Expiring in One Year	0
Active [Member] | Currently Under Drilling Contract [Member]
Accounting Policies [Line Items]
Drilling Rigs	57
Active [Member] | Term Contract [Member] | Currently Under Drilling Contract [Member]
Accounting Policies [Line Items]
Drilling Rigs	43
Active [Member] | Term Contract [Member] | Currently Under Drilling Contract [Member] | Colombia [Member]
Accounting Policies [Line Items]
Drilling Rigs	7
Minimum [Member]
Accounting Policies [Line Items]
Drilling Rigs, Contractual Terms	six months
Maximum [Member]
Accounting Policies [Line Items]
Drilling Rigs, Contractual Terms	4 years