Income Taxes (Details)	3 Months Ended
	Mar. 31, 2015
Internal Revenue Service (IRS) | Maximum
Income Tax [Line Items]
Tax Year Closed	2009
ARIZONA | Earliest Tax Year
Income Tax [Line Items]
Income Tax Examination, Year under Examination	2009
ARIZONA | Latest Tax Year
Income Tax [Line Items]
Income Tax Examination, Year under Examination	2012
NEW MEXICO | Maximum
Income Tax [Line Items]
Tax Year Closed	2009
TEXAS | Earliest Tax Year
Income Tax [Line Items]
Income Tax Examination, Year under Examination	2007
TEXAS | Latest Tax Year
Income Tax [Line Items]
Income Tax Examination, Year under Examination	2011