Amount of deferred tax liability attributable to taxable temporary difference due within one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Income Taxes (Narratives) (Details) (USD $) In Millions, unless otherwise specified		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Maximum	Sep. 30, 2014 Minimum	Aug. 06, 2014 Business combination Office building in Stavanger, Norway
Income Tax Contingency [Line Items]
Deferred tax liability				$ 14.6
Unrecognized tax benefits	$ 1.6
Income Tax Disclosures
Open tax years by major jurisdictions		2014	2008