Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	Oct. 02, 2012	Sep. 30, 2012	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Apr. 30, 2015
Settlement reducing cash consideration
Indemnification claims for Net Debt Working Capital and certain adverse consequences not recognized due to the contingent nature of these claims			$ 4,088		$ 4,088
Central
Acquisitions
Interest acquired (as a percent)	100.00%
Common stock issued (in shares)	6,161,332
Assumption of debt, net of cash acquired	$ 217,675
Maximum Net Debt Working Capital threshold amount	$ 275,000
Period after which contingent cash consideration to be paid	3 years
Price of share at which former stockholders of acquiree can elect to pay applicable amount (in dollars per share)	$ 23.64
Minimum cash consideration to cover capped indemnities	$ 17,000
Settlement reducing cash consideration
Period in which reduction in cash consideration payable for the seller's indemnification made					3 years
Cash consideration payable in three years from the acquisition date, pursuant to the Merger Agreement and prior to Central Net Debt Working Capital and indemnification of certain defined adverse consequences, net	27,000		27,000		$ 27,000
Net Debt Working Capital at September 30, 2012 as defined in the Merger Agreement		$ 297,332	(297,332)		(297,332)
Threshold of Net Debt Working Capital, pursuant to the Merger Agreement	$ 285,000		285,000		285,000
Excess over the threshold of Net Debt Working Capital		$ 12,332			(12,332)
Indemnification of certain defined adverse consequences, net					(18,756)
Indemnification claims for Net Debt Working Capital and certain adverse consequences in excess of the $27,000 cash consideration payable in three years from the acquisition date			(4,088)		(4,088)
Reduction of cash consideration payable			12,332		$ 12,332
Net Debt Working Capital at September 30, 2012 asserted by representative of former stockholders							$ 270,757
Net Debt Capital difference as of September 30, 2012 below the lower threshold							$ 4,242
Indemnification of cost pursuant to merger agreement					80.00%
Acquisition and integration related costs included in general and administrative expenses			$ 374	$ 537	$ 1,872	$ 2,042