Document Description File Type Size iosp-20180331.xml XBRL Instance Document EX-101.INS 675 KB iosp-20180331.xsd XBRL Taxonomy Extension Schema EX-101.SCH 49 KB iosp-20180331_cal.xml XBRL Taxonomy Extension Calculation Linkbase EX-101.CAL 74 KB iosp-20180331_def.xml XBRL Taxonomy Extension Definition Linkbase EX-101.DEF 181 KB iosp-20180331_lab.xml XBRL Taxonomy Extension Label Linkbase EX-101.LAB 425 KB iosp-20180331_pre.xml XBRL Taxonomy Extension Presentation Linkbase EX-101.PRE 317 KB