Earnings Per Common Share Schedule of Weighted Average Number of Shares (Details) - shares shares in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Potential issuable common shares used to calculate weighted average share equivalents	1,477	1,280	1,063