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Earnings Per Share Components of Earnings Per Share (Details)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Weighted-average common shares outstanding - basic 78,203 77,637 78,170 76,401
Dilutive effect of potential common shares 2,022 693 1,807 302
Weighted-average common shares outstanding - diluted 80,225 78,330 79,977 76,703