Earnings Per Share Securities Excluded Due to Exercise Price Exceeding Average Price During Period (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Shares Excluded Due to Exercise Price Exceeding Average Price During Period [Line Items]
Total shares excluded due to exercise price exceeding the average market price of common shares during the period (in shares)	750	16	820	136
Options, restricted stock, or other dilutive securities
Shares Excluded Due to Exercise Price Exceeding Average Price During Period [Line Items]
Total shares excluded due to exercise price exceeding the average market price of common shares during the period (in shares)	750	16	820	136