Stockholders' Equity Computation of diluted weighted average shares outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average shares outstanding - basic	52,276,951	52,274,573	51,757,867
Weighted average number diluted shares outstanding adjustment	1,705,224	1,783,199	2,143,173
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	18,904	18,904	0
Weighted average shares outstanding - diluted	54,001,079	54,076,676	53,901,040
Antidilutive securities excluded from computation of earnings per share, amount	616,000	568,000	585,000