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Other	9 Months Ended
Other	Sep. 30, 2016
Debt and Other Disclosures [Abstract]
Debt Disclosure	Debt In September 2016, our $350.0 million 7.125% senior unsecured notes matured. In May 2016, we issued a total of $600.0 million aggregate principal amount of senior notes: (i) $350.0 million aggregate principal amount of senior notes due in 2021 with an annual coupon rate of 3.00%, and (ii) $250.0 million aggregate principal amount of senior notes due in 2042 with an annual coupon rate of 5.75%, pursuant to a reopening of the $250.0 million aggregate principal amount outstanding of our 5.75% senior notes due 2042 issued in 2012. Both issuances are callable at or above par and rank equally in the right of payment with all of our other unsecured and unsubordinated debt. In March 2016, we amended the terms of our five-year $400.0 million credit facility, which was previously set to expire in 2018, to extend through March 2021. At September 30, 2016, letters of credit totaling $2.1 million had been issued from the credit facility, but there were no borrowed amounts outstanding. During the nine months ended September 30, 2016, we made principal payments of $49.0 million on our senior secured non-recourse notes issued by Northwind Holdings, LLC.
Income Tax Disclosure	Income Tax During the third quarter of 2016, the U.K. government enacted an income tax rate reduction that will reduce the rate to 17 percent effective April 2020. Prior to this enactment, the rate had been scheduled to reduce to 18 percent in 2020. We are required to adjust deferred tax assets and liabilities through income on the date of enactment of a rate change. As a result, we recorded income tax benefits of $4.5 million during the third quarter of 2016. We have a net operating loss carryforward for U.S. income tax of $1.0 million and an alternative minimum tax credit carryforward of $0.6 million resulting from our third quarter of 2016 acquisition of Starmount. The alternative minimum tax credit carryforward does not expire, and the net operating loss carryforward will expire between 2020 and 2035. We have net operating loss carryforwards for state income tax of $156.4 million which will expire between 2016 and 2036. During the third quarter of 2016, we recorded a deferred tax asset for future state income tax benefits of $16.0 million along with a corresponding valuation allowance of $14.1 million to reduce the deferred tax asset to the amount that is more likely than not to be realized. During 2015, we recorded a valuation allowance of $1.3 million related to unrealized tax losses on buildings which we own and occupy in the U.K., the amount of which is unchanged other than for foreign currency translation. In the first quarter of 2015, we reached agreement with the Internal Revenue Service on all outstanding issues related to the examinations for 2009 and 2010 tax years and refund claims filed for tax credits related to tax years 2003 through 2012. As a result of this agreement, we reduced our reserve for uncertain tax positions in our consolidated balance sheet by $19.3 million. We also recognized in our consolidated statements of income a reduction in federal income taxes of $5.8 million.