Share-Based Compensation (RSUs Vested and Converted) (Details) - RSUs - shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs vested during the year	1,063	954	1,037
RSUs converted during the year, net of shares withheld for taxes	705	1,238	1,734
Shares withheld for taxes	358	549	796