XML 106 R90.htm IDEA: XBRL DOCUMENT v3.8.0.1
SEGMENT INFORMATION - Schedule of Assets by Region (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Long-lived assets, excluding goodwill and other intangible assets $ 588,348 $ 526,370
United States    
Segment Reporting Information [Line Items]    
Long-lived assets, excluding goodwill and other intangible assets 451,436 413,499
Foreign countries    
Segment Reporting Information [Line Items]    
Long-lived assets, excluding goodwill and other intangible assets $ 136,912 $ 112,871