Cash Dividend (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
May 31, 2018	Sep. 29, 2018	Sep. 23, 2017
Cash Dividend [Abstract]
Common stock cash dividends per share declared	$ 0.20
Dividends to shareholders		$ 13,362	$ 11,973

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

Name:	us-gaap_PaymentsOfDividends
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration