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Newly Adopted Accounting Principles
 12 Months Ended
Dec. 31, 2014
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
Newly Adopted Accounting Pronouncements
2.
New Accounting Pronouncements
Presentation of Unrecognized Tax Benefits
In July 2013, the FASB issued amendments to guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss or a tax credit carryforward exists. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. Adoption of this guidance did not have a material impact on our results of operations or financial position.