Acquisitions (Details) (Central, USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Oct. 02, 2012	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2012	Apr. 30, 2015
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
Indemnification of cost pursuant to merger agreement		80.00%
Net Debt Working Capital at September 30, 2012 as defined in the Merger Agreement				(296,153)
Threshold of Net Debt Working Capital, pursuant to the Merger Agreement				285,000
Excess over the threshold of Net Debt Working Capital		(11,153)		(11,153)
Additional Net Debt Working Capital claims not recognized				1,600
Indemnification of certain defined adverse consequences, net		(14,925)
Reduction of cash consideration payable				14,925
Settled cash consideration		922
Net Debt Working Capital at September 30, 2012 asserted by representative of former stockholders					270,757
The amount of Net Debt Capital difference below the lower threshold					4,242
Acquisition and integration related costs included in general and administrative expenses		$ 1,498	$ 1,505