Business Combinations - Purchase accounting (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Business Acquisition [Line Items]
Cash and cash equivalents	$ 75,821
Accounts receivable, net	179,745
Inventories, net	95,193
Prepaid expenses and other assets	11,373
Deferred tax asset	8,703
Property, plant and equipment	125,099
Right of use lease assets	10,747
Investments in associated companies	69,683
Other non-current assets	1,368
Intangible assets	1,022,500
Goodwill	483,921
Total assets purchased	2,084,153
Short-term debt, not refinanced at closing	9,297
Accounts payable, accrued expenses and other current liabilities	152,829
Deferred tax liabilities	213,779
Long-term lease liabilities	6,655
Other non-current liabilities	39,128
Total liabilities assumed	421,688
Total consideration paid for Houghton	1,662,465
Cash Acquired	75,821
Fair value of common stock issued as consideration	789,080
Net cash paid for Houghton	$ 797,564