Earnings Per Share Securities Excluded Due to Exercise Price Exceeding Average Price During Period (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Shares Excluded Due to Exercise Price Exceeding Average Price During Period [Line Items]
Shares Excluded Due to Exercise Price Exceeding Average Price During Period	48	224	74	285
Outstanding Stock Awards [Member]
Shares Excluded Due to Exercise Price Exceeding Average Price During Period [Line Items]
Shares Excluded Due to Exercise Price Exceeding Average Price During Period	48	224	74	285