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Deferred Charges and Other Assets	3 Months Ended
Deferred Charges and Other Assets	Mar. 31, 2019
Other Assets, Noncurrent [Abstract]
Deferred Charges and Other Assets	Deferred Charges and Other Assets Amortization expense on other assets of $4,630 and $5,541 is included in costs of sales in the consolidated statements of operations for the three months ended March 31, 2019 and 2018, respectively.