XML 55 R37.htm IDEA: XBRL DOCUMENT v3.8.0.1
Summary of Significant Accounting Policies (Details 2) - $ / shares
Jun. 09, 2017
Jun. 10, 2016
Jun. 05, 2015
Dividend Payable 1 [Member]      
Dividend Date Jun. 30, 2017 Jun. 30, 2016 Jun. 30, 2015
Record Date Jun. 19, 2017 Jun. 16, 2016 Jun. 16, 2015
Dividend per share $ 0.51 $ 0.51 $ 0.51
Dividend Payable 2 [Member]      
Dividend Date Sep. 29, 2017 Sep. 30, 2016 Sep. 30, 2015
Record Date Sep. 15, 2017 Sep. 15, 2016 Sep. 15, 2015
Dividend per share $ 0.51 $ 0.51 $ 0.51
Dividend Payable 3 [Member]      
Dividend Date Dec. 29, 2017 Dec. 30, 2016 Dec. 31, 2015
Record Date Dec. 15, 2017 Dec. 14, 2016 Dec. 15, 2015
Dividend per share $ 0.51 $ 0.51 $ 0.51
Dividend Payable 4 [Member]      
Dividend Date Mar. 30, 2018 Mar. 31, 2017 Mar. 31, 2016
Record Date Mar. 15, 2018 Mar. 15, 2017 Mar. 16, 2016
Dividend per share $ 0.51 $ 0.51 $ 0.51