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Income Taxes, Operating Loss Carryforward Expirations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ (73,532)
Total	(73,532)
Income tax benefit and valuation allowance recorded directly to equity		$ 370
Canada [Member]
Operating Loss Carryforwards [Line Items]
Expiring noncapital loss carryforwards	(45,349)
Capital loss carryforwards	53,875
U.S. [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(20,830)
Mexico [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(7,187)
Barbados [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(166)
Australia [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	(32,002)
Tax Year 2017 [Member]
Operating Loss Carryforwards [Line Items]
Total	(1)
Tax Year 2017 [Member] | Barbados [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(1)
Tax Year 2018 [Member]
Operating Loss Carryforwards [Line Items]
Total	(6)
Tax Year 2018 [Member] | Barbados [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(6)
Tax Year 2019 [Member]
Operating Loss Carryforwards [Line Items]
Total	(20)
Tax Year 2019 [Member] | Barbados [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(20)
Tax Year 2020[Member]
Operating Loss Carryforwards [Line Items]
Total	(42)
Tax Year 2020[Member] | Barbados [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(42)
Tax Year 2021 [Member]
Operating Loss Carryforwards [Line Items]
Total	(20)
Tax Year 2021 [Member] | Barbados [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(20)
Tax Year 2022 [Member]
Operating Loss Carryforwards [Line Items]
Total	(5,964)
Tax Year 2022 [Member] | Mexico [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(5,933)
Tax Year 2022 [Member] | Barbados [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(31)
Tax Year 2023 [Member]
Operating Loss Carryforwards [Line Items]
Total	(347)
Tax Year 2023 [Member] | Mexico [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(325)
Tax Year 2023 [Member] | Barbados [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(22)
Tax Year 2024 [Member]
Operating Loss Carryforwards [Line Items]
Total	(4)
Tax Year 2024 [Member] | Barbados [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(4)
Tax Year 2025 [Member]
Operating Loss Carryforwards [Line Items]
Total	(78)
Tax Year 2025 [Member] | Mexico [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(70)
Tax Year 2025 [Member] | Barbados [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(8)
Tax Year 2026 [Member]
Operating Loss Carryforwards [Line Items]
Total	(1,687)
Tax Year 2026 [Member] | Canada [Member]
Operating Loss Carryforwards [Line Items]
Expiring noncapital loss carryforwards	(1,027)
Tax Year 2026 [Member] | Mexico [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(654)
Tax Year 2026 [Member] | Barbados [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(6)
Tax Year 2027 [Member]
Operating Loss Carryforwards [Line Items]
Total	(1,058)
Tax Year 2027 [Member] | Canada [Member]
Operating Loss Carryforwards [Line Items]
Expiring noncapital loss carryforwards	(847)
Tax Year 2027 [Member] | Mexico [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(205)
Tax Year 2027 [Member] | Barbados [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(6)
Tax Year 2028 [Member]
Operating Loss Carryforwards [Line Items]
Total	(6,532)
Tax Year 2028 [Member] | Canada [Member]
Operating Loss Carryforwards [Line Items]
Expiring noncapital loss carryforwards	(5,245)
Tax Year 2028 [Member] | U.S. [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(1,287)
Tax Year 2029 [Member]
Operating Loss Carryforwards [Line Items]
Total	(5,741)
Tax Year 2029 [Member] | Canada [Member]
Operating Loss Carryforwards [Line Items]
Expiring noncapital loss carryforwards	(4,022)
Tax Year 2029 [Member] | U.S. [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(1,719)
Tax Year 2030 [Member]
Operating Loss Carryforwards [Line Items]
Total	(7,002)
Tax Year 2030 [Member] | Canada [Member]
Operating Loss Carryforwards [Line Items]
Expiring noncapital loss carryforwards	(5,032)
Tax Year 2030 [Member] | U.S. [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(1,970)
Tax Year 2031 [Member]
Operating Loss Carryforwards [Line Items]
Total	(5,633)
Tax Year 2031 [Member] | Canada [Member]
Operating Loss Carryforwards [Line Items]
Expiring noncapital loss carryforwards	(3,806)
Tax Year 2031 [Member] | U.S. [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(1,827)
Tax Year 2032 [Member]
Operating Loss Carryforwards [Line Items]
Total	(9,804)
Tax Year 2032 [Member] | Canada [Member]
Operating Loss Carryforwards [Line Items]
Expiring noncapital loss carryforwards	(6,397)
Tax Year 2032 [Member] | U.S. [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(3,407)
Tax Year 2033 [Member]
Operating Loss Carryforwards [Line Items]
Total	(8,399)
Tax Year 2033 [Member] | Canada [Member]
Operating Loss Carryforwards [Line Items]
Expiring noncapital loss carryforwards	(6,076)
Tax Year 2033 [Member] | U.S. [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(2,323)
Tax Year 2034 [Member]
Operating Loss Carryforwards [Line Items]
Total	(7,518)
Tax Year 2034 [Member] | Canada [Member]
Operating Loss Carryforwards [Line Items]
Expiring noncapital loss carryforwards	(4,420)
Tax Year 2034 [Member] | U.S. [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(3,098)
Tax year 2035 [Member]
Operating Loss Carryforwards [Line Items]
Total	(3,731)
Tax year 2035 [Member] | Canada [Member]
Operating Loss Carryforwards [Line Items]
Expiring noncapital loss carryforwards	(3,729)
Tax year 2035 [Member] | U.S. [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(2)
Tax Year 2036 [Member]
Operating Loss Carryforwards [Line Items]
Total	(5,454)
Tax Year 2036 [Member] | Canada [Member]
Operating Loss Carryforwards [Line Items]
Expiring noncapital loss carryforwards	(2,799)
Tax Year 2036 [Member] | U.S. [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	(2,655)
Tax Year 2037 [Member]
Operating Loss Carryforwards [Line Items]
Total	(4,491)
Tax Year 2037 [Member] | Canada [Member]
Operating Loss Carryforwards [Line Items]
Expiring noncapital loss carryforwards	(1,949)
Tax Year 2037 [Member] | U.S. [Member]
Operating Loss Carryforwards [Line Items]
Expiring net operating loss carryforwards	$ (2,542)

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