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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

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

Subsequent Events: (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Mar. 24, 2016	Feb. 23, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Subsequent events
Regular quarterly dividend (in dollars per share)		$ 0.36
Expected value of dividend to be paid			$ 66,314	$ 54,216	$ 35,352
Subsequent Event \| Expected
Subsequent events
Expected value of dividend to be paid	$ 15,900