Annual report pursuant to Section 13 and 15(d)

Relationship with Solvay (Details)

v3.8.0.1
Relationship with Solvay (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 01, 2014
Jul. 28, 2014
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disaggregation of Revenue                          
Selling, general and administrative expenses                     $ 145,107 $ 107,601 $ 34,613
Product revenue     $ 358,074 $ 391,829 $ 389,267 $ 332,931 $ 322,731 $ 369,979 $ 277,554 $ 93,913 1,472,101 1,064,177 388,875
Transition Services Agreement | Solvay                          
Disaggregation of Revenue                          
Selling, general and administrative expenses                         4,882
Cross-Services Agreement | Aroma                          
Disaggregation of Revenue                          
Arrangement term   5 years                      
Product revenue                     1,068 1,047 1,272
Service revenue                     1,600 1,615 1,544
Shared costs reimbursements                     2,028 2,686 3,745
Silica Sales Agreement | Silicia                          
Disaggregation of Revenue                          
Arrangement term 5 years                        
Product revenue                     $ 1,666 $ 1,743 $ 1,983