Income Taxes	3 Months Ended
Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company's tax benefit of $52.5 million and tax expense of $3.7 million for the three months ended March 31, 2014 and 2013, respectively, includes remeasurement benefit of $1.4 million and remeasurement expense of $1.6 million related to foreign tax accounts, respectively. The 2014 effective tax rate before remeasurement is based on the Company's estimated full year effective tax rate, which is comprised of the expected statutory tax expense that is more than offset by reductions from percentage depletion, foreign rate differential and Australian minerals resource rent tax. During the three months ended March 31, 2014, the Company recorded a valuation allowance on certain Australian deferred tax assets amounting to $42.6 million that, in the judgment of management, are not considered more likely than not to be realized. During the three months ended March 31, 2014, the Company decreased its unrecognized tax benefits, interest and penalties by $28.9 million due to a settlement on the 2004 through 2010 Australian Taxation Office (ATO) audit relating to certain financing transactions. The Company previously made a $34.9 million advance deposit to the ATO and received a refund of $6.0 million in April 2014. During the three months ended March 31, 2014, the U.S. Internal Revenue Service (IRS) added the 2011 through 2013 tax years to the 2009 through 2010 audit due to amended returns filed for capital and net operating loss carrybacks. The Company believes during the next twelve months it is reasonably possible for a $25.0 million decrease in its net unrecognized tax benefits due to potential audit settlements.

Income Taxes

3 Months Ended

Mar. 31, 2014

The Company's tax benefit of $52.5 million and tax expense of $3.7 million for the three months ended March 31, 2014 and 2013, respectively, includes remeasurement benefit of $1.4 million and remeasurement expense of $1.6 million related to foreign tax accounts, respectively. The 2014 effective tax rate before remeasurement is based on the Company's estimated full year effective tax rate, which is comprised of the expected statutory tax expense that is more than offset by reductions from percentage depletion, foreign rate differential and Australian minerals resource rent tax. During the three months ended March 31, 2014, the Company recorded a valuation allowance on certain Australian deferred tax assets amounting to $42.6 million that, in the judgment of management, are not considered more likely than not to be realized.

During the three months ended March 31, 2014, the Company decreased its unrecognized tax benefits, interest and penalties by $28.9 million due to a settlement on the 2004 through 2010 Australian Taxation Office (ATO) audit relating to certain financing transactions. The Company previously made a $34.9 million advance deposit to the ATO and received a refund of $6.0 million in April 2014. During the three months ended March 31, 2014, the U.S. Internal Revenue Service (IRS) added the 2011 through 2013 tax years to the 2009 through 2010 audit due to amended returns filed for capital and net operating loss carrybacks.

The Company believes during the next twelve months it is reasonably possible for a $25.0 million decrease in its net unrecognized tax benefits due to potential audit settlements.