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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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