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Significant Accounting Policies (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | [1]
Significant Accounting Policies [Line Items] |  |  |  |
Impairment of assets |  | $ 20,000,000 | $ 0 | $ 95,088,000
Withholding tax on amounts repatriated | 5.00% | 5.00% |  |
Petrobas America Inc [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of acquired entity reported | 100.00% |  |  |
Percentage of acquired entity noncontrolling interest reported | 20.00% |  |  |
Stock Options [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Stock-based compensation, fair value assumption model |  | Black-Scholes option pricing model |  |
Performance Based Restricted Stock [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Stock-based compensation, fair value assumption model |  | Monte Carlo valuation model |  |
Stock-based compensation, vesting period |  | 3 years |  |
Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Equity method investment, ownership percentage | 20.00% | 20.00% |  |
Minimum [Member] | Stock Options [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Stock-based compensation, vesting period |  | 2 years |  |
Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Equity method investment, ownership percentage | 50.00% | 50.00% |  |
Maximum [Member] | Stock Options [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Stock-based compensation, vesting period |  | 3 years |  |
Malaysia [Member] | Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Depreciable lives, straight-line method |  | 20 years |  |
Malaysia [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Depreciable lives, straight-line method |  | 25 years |  |
[1] | Reclassified to conform to current presentation (see Note B).

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