Stockholders' Equity Computation of diluted weighted average shares outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average shares outstanding - basic	51,487,557	52,523,272	52,276,951
Weighted average number diluted shares outstanding adjustment	1,499,713	1,793,375	1,705,224
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	1,640,477	799,680	18,904
Weighted average shares outstanding - diluted	54,627,747	55,116,327	54,001,079
Antidilutive securities excluded from computation of earnings per share, amount	458,000	798,000	616,000