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Share-Based Compensation Plans (Allocated Share-Based Compensation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]      
Share-based compensation incurred $ 12,371 $ 11,227 $ 12,074
Capitalized share-based compensation (1,385) (1,310) (868)
Share-based compensation expense $ 10,986 $ 9,917 $ 11,206