Earnings Per Share Components of Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Weighted-average common shares outstanding - basic	88,766	78,203	82,633	78,170
Dilutive effect of potential common shares	0	2,022	0	1,807
Weighted-average common shares outstanding - diluted	88,766	80,225	82,633	79,977