XML 19 R5.htm IDEA: XBRL DOCUMENT v3.3.1.900
Consolidated Statement of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Income and Comprehensive Income [Abstract]      
Unrealized loss on investments, tax $ 946 $ 0 $ 0