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Basis of Presentation - Revenue, Initial Application Period Cumulative Effect Transition (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Net sales $ 262,654 $ 243,604 $ 1,062,156 $ 857,079    
Accounts receivable, net 130,033   130,033   $ 78,569 $ 94,725
Deferred taxes, net 65,045   65,045   96,369 91,398
Income taxes payable 10,827   10,827     1,295
Retained earnings 443,247   443,247   312,896 $ 324,081
Income tax provision 1,335 1,486 35,801 30,742    
Net income 9,740 $ 3,089 133,405 $ 60,443    
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Net sales 260,069   1,068,640      
Accounts receivable, net 152,673   152,673      
Deferred taxes, net 59,791   59,791      
Income taxes payable 11,916   11,916      
Retained earnings 459,544   459,544      
Income tax provision 730   37,173      
Net income 7,760   138,517      
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Net sales 2,585   (6,484)      
Accounts receivable, net (22,640)   (22,640)   (16,156)  
Deferred taxes, net 5,254   5,254   4,971  
Income taxes payable (1,089)   (1,089)      
Retained earnings (16,297)   (16,297)   $ (11,185)  
Income tax provision 605   (1,372)      
Net income $ 1,980   $ (5,112)