Write Downs and Other Charges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Write Downs And Other Charges [Line Items]
Write downs and other charges	$ 4,249	$ 1,450	$ 15,458	$ 3,394
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed	3,249		10,866
Impairment of Intangible Assets, Finite-lived			2,293
write-off of prepaids	702		1,339
(Gain) Loss on Sale of Assets and Asset Impairment Charges	$ 266		1,161
Impairment of Long-Lived Assets			173
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			$ (375)