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Share-based Compensation Directors' Stock Grants (Details) - USD ($)
shares in Thousands, $ 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]      
Nonemployee directors stock awards, Quantity of Securities Issued 28 23 8
Nonemployee directors stock awards, Amount recognized in equity $ 633 $ 682 $ 588