Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
Nov. 30, 2013	Mar. 31, 2014
Commitments and Contingencies
Purchase orders outstanding for drilling equipment		$ 189.7
Gain contingencies recognized in consolidated financial statements		0
Monetary penalty paid	5.4
Organizational community service payment	$ 1.0

Amount of gain recognized in the period that had been disclosed in prior periods as a contingent gain.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 30

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6397426&loc=d3e17499-108355

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant