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Fair Value Disclosures (Narrative) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]    
Fair value of debt $ 1,100,000 $ 1,100,000
Book value of debt 1,100,000 1,100,000
Accounts receivable, book value 96,986 147,495
Fair value of accounts payable [1] $ 25,291 $ 35,288
[1] Accounts payable is generally stated at historical amounts with the exception of $25.3 million and $35.3 million at March 31, 2017 and December 31, 2016, respectively, related to certain delivered inventory for which the payable fluctuates based on changes in commodity prices. These payables are hybrid financial instruments for which the company has elected the fair value option.