Annual report pursuant to Section 13 and 15(d)

Statements of Comprehensive Income (Parenthetical)

v3.6.0.2
Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Depreciation $ 11,429 $ 11,965 $ 10,339