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Net Income Per Share Weighted Average Diluted Common Shares Outstanding (Details)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Total number of anti-dilutive potential common shares 1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 227us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount