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Fair Value Measurements and Derivative Instruments Reporting (Narrative) (Details) CAD in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2017 CAD | Jun. 30, 2017 USD ($) | Apr. 30, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  | $ 0 |  | $ 0 |
Operating expenses | $ 33,689,000 | $ 30,660,000 | $ 65,596,000 | $ 59,807,000 |  |  |  |
Katowice Leashold Improvements [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets measured at fair value on a nonrecurring basis |  |  |  |  | 0 |  | $ 0 |
Operating expenses |  |  |  |  | $ 400,000 |  |  |
BMO Credit Agreement [Member] | Interest Rate Swap Liability [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  | Aug. 01, 2019 |  |  |  |  |
Notional Value |  |  |  |  |  | CAD 8.4 |  | $ 6,500,000
CDOR exchange rate |  |  |  |  |  | 3.92 | 3.92 |

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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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