Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental cash flow information
Interest paid	$ 2,732	$ 2,683	$ 3,882
Income taxes paid, net	20,133	11,131	2,137
Noncash transactions
Debt issued for purchases of businesses	30	100	500
Detail of acquisitions:
Receivables	0	474	16
Operating supplies	0	209	0
Prepaid expense	0	47	0
Equipment	0	1,826	321
Intangibles	110	3,812	1,190
Liabilities assumed	0	(1,868)	(65)
Debt issued for purchases of businesses	(30)	(100)	(500)
Cash paid	$ 80	$ 4,400	$ 962

Business acquisition, purchase price allocation, intangible assets

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Amount of cash paid to acquire the entity.

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Fair Value of the liabilities incurred by the acquirer to former owners of the acquiree, including the fair value of any contingent consideration. If liabilities transferred as consideration remain within the combined entity after the business combination (for example, because the assets or liabilities were transferred to the acquiree rather than to its former owners), and the acquirer therefore retains control of them; in that situation, the acquirer measures those liabilities at their carrying amounts immediately before the acquisition date.

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The amount of acquisition cost of a business combination allocated to inventory, including finished goods, work-in-process, and raw materials.

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The amount of acquisition cost of a business combination allocated to prepaid expenses and other current assets. Does not include amounts allocated to cash and cash equivalents, marketable securities, receivables, inventory, and assets not to be used.

+ References

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The amount of acquisition cost of a business combination allocated to liabilities assumed.

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-Name Emerging Issues Task Force (EITF)

-Number 98-1

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The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

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- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The amount of cash paid for interest during the period.

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