Unaudited Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, non-trade	$ 10,988	$ 7,883
Accounts receivable, related party balance	18,014	57,062
Accumulated depreciation on vessels and equipment	1,294,622	1,293,447
Sale Leaseback Transaction, Accumulated Depreciation	$ 93,858	$ 51,290
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, share authorized (in shares)	725,000,000	725,000,000
Common stock, share outstanding (in shares)	100,699,409	100,435,210
Common stock, share issued (in shares)	100,699,409	100,435,210

Finance Leases, Lessee Balance Sheet Assets by Major Class Accumulated Deprecation

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Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The sum of amounts currently receivable other than from customers. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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