Stockholders' Equity Earnings Per Share (Details) (USD $) In Millions, except Share data, 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]
Repayments of Convertible Debt				$ 3.6
Weighted average number of shares outstanding - basic	52,512,474	50,093,786	51,658,823	49,829,379
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	2,107,319	2,025,802	2,081,328	1,664,274
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	0	80,884	0	85,991
Weighted Average Number of Shares Outstanding, Diluted	54,619,793	52,200,472	53,740,151	51,579,644