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Earnings per Share (Details) - $ / shares
shares in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive potential common shares excluded from computation of earnings per share 2,034 2,182
Debt Instrument, Convertible, Stock Price Trigger $ 33.79