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Significant Accounting Policies Significant Accounting Policies (Supplemental Cash Flow Information) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Disclosure of Noncash Investing and Financing Activities [Abstract]      
Noncash or Part Noncash Acquisition, Fixed Assets Acquired $ 0 $ 0 $ 3,552