Earnings Per Share Securities Excluded Due to Exercise Price Exceeding Average Price During Period (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 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	121	387
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	121	387