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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Supplemental disclosure:
Interest paid	$ 0	$ 0	$ 5	$ 0
Income taxes paid	451	4,127	6,683	4,488
Non-cash investing and financing activities:
Non-cash capital expenditures	(1,604)	(874)	(871)	224
Dividends declared	$ 8,400	$ 6,849	$ 8,400	$ 6,849

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- Definition

Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

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-Publisher FASB
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-Topic 230
-SubTopic 10
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