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Business Combinations (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Feb. 28, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Business combinations
Operating income		$ 33,102	$ 39,311	$ 45,296	$ 87,337
Goodwill		124,562		124,562		$ 119,410
Aevenia
Business combinations
Fair value of consideration	$ 22,700
Cash payment made	22,300
Payable to sellers	$ 400
Current assets		4,200		4,200
Current liabilities		2,100		2,100
Plant and equipment		11,200		11,200
Intangibles assets		3,850		3,850
Goodwill		$ 5,150		$ 5,150
Goodwill and other intangible assets deductible for income tax purposes	15 years
Aevenia | Customer relationships
Business combinations
Intangibles assets	$ 2,500
Aevenia | Non-compete agreements
Business combinations
Intangibles assets	$ 1,350

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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