Convertible Debt 2021 Conversion Feature, Initial Fair Value

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Convertible Debt 2022 Conversion Feature, Initial Fair Value

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Convertible due 2021 - Bond Hedge, Initial Fair Value

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Convertible due 2022 - Bond Hedge, Fair Value at Issuance

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Derivative, Percentage of Forcasted Transactions With Currency Rate Exposure

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Notional Amount of Derivatives, Matured During Period

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount of increase in the fair value of derivatives recognized in the income statement.

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Amount of decrease in the fair value of derivatives recognized in the income statement.

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The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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Derivatives Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
Derivatives Narrative (Details) - USD ($)	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Derivative [Line Items]
Convertible Debt 2022 Conversion Feature, Initial Fair Value	$ 28,859,000		$ 28,859,000
Proceeds from Issuance of Warrants						$ 12,376,000
Foreign currency forward contracts
Derivative [Line Items]
Notional amount of derivatives, matured during period			71,239,000	$ 50,475,000
Selling, General and Administrative Expenses \| Foreign currency forward contracts
Derivative [Line Items]
Gain recognized in income		$ 197,000		427,000
Loss on derivative	(202,000)		$ (214,000)
Minimum
Derivative [Line Items]
Derivative, percentage of forcasted transactions with currency rate exposure			50.00%
Maximum
Derivative [Line Items]
Derivative, percentage of forcasted transactions with currency rate exposure			90.00%
Cash Flow Hedging [Member]
Derivative [Line Items]
Gain (Loss)	380,000	(638,000)	$ 620,000	(914,000)
Cash Flow Hedging [Member] \| Sales [Member]
Derivative [Line Items]
Loss on derivative	(164,000)	(209,000)	(8,000)	(234,000)
Cash Flow Hedging [Member] \| Cost of Sales [Member]
Derivative [Line Items]
Gain recognized in income	544,000		628,000
Loss on derivative		$ (429,000)		$ (680,000)
Convertible Subordinated Debt \| Convertible Senior Notes at 5.00% February 2021 [Member]
Derivative [Line Items]
Convertible due 2021 - Bond Hedge, Initial Fair Value	27,975,000		27,975,000
Convertible Debt Conversion Feature, Initial Fair Value	(34,480,000)		(34,480,000)
Debt Instrument, Face Amount	$ 150,000,000		$ 150,000,000				$ 150,000,000
Interest rate (as a percent)	5.00%		5.00%
Convertible Subordinated Debt \| Convertible Senior Notes at 4.50% February 2022 [Domain]
Derivative [Line Items]
Proceeds from Issuance of Warrants					$ 14,100,000
Convertible due 2022 - Bond Hedge, Fair Value at Issuance	$ 24,780,000		$ 24,780,000
Debt Instrument, Face Amount	$ 120,000,000		$ 120,000,000				$ 120,000,000
Interest rate (as a percent)	4.50%		4.50%