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Supplemental cash flow information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash paid for:
Interest	$ 160	$ 5
Income taxes	2,596	1,142
Non-cash investing activities:
Accrued capital costs	$ 206	$ 1,202

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Future cash outflow to pay for construction in progress expenditures that have occurred.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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