Stockholders' Equity Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Weighted average number of shares outstanding - basic	52,061,158	51,935,757	52,373,462	51,804,459
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1,720,448	1,722,747	1,666,114	1,688,121
Weighted Average Number of Shares Outstanding, Diluted	53,781,606	53,658,504	54,039,576	53,492,580