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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	$ 447	$ 180	$ 559
Cash paid for income taxes, net of refunds	8,754	20,499	28,004
Non-cash transactions:
Change in accounts payable related to capital expenditures	1,658	(3,534)	(3,479)
Insurance premium financed by note payable	0	7,630	0
Value of shares issued for Blackhawk Group acquisition	$ 144,047	$ 0	$ 0

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Change In Capital Expenditures Incurred But Not Yet Paid, Increase (Decrease)

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Insurance Premium Financed by Notes Payable

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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The amount of cash paid for interest during the period.

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Value of stock issued pursuant to acquisitions during the period.

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