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Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Concentration Risk [Line Items]
Other Nonoperating Income (Expense)	$ 3,257	$ 2,292	$ 2,637
Provision (reversal) for doubtful accounts	$ 590	$ (231)	$ 3,347
CMA CGM S.A | Operating and Capital Leases Billing [Member] [Domain] | Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	21.00%	20.00%	19.00%
Mediterranean Shipping Company [Member] | Operating and Capital Leases Billing [Member] [Domain] | Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	14.00%	14.00%	14.00%
Mediterranean Shipping Company [Member] | Accounts Receivable [Member] | Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	6.00%	5.00%
CMACGN | Accounts Receivable [Member] | Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	21.00%	29.00%
Hanjin Shipping Co. [Member]
Concentration Risk [Line Items]
Other Nonoperating Income (Expense)			$ 6,800

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