Aggregate dividends paid during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Aggregate dividends declared during the period for each share of common stock outstanding.

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+ References

No definition available.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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- Definition

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

+ References

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=66902209&loc=d3e3291-108585

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Dividends and Earnings per Share - Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands												3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 11, 2017	Sep. 08, 2017	Aug. 01, 2017	Jun. 09, 2017	May 02, 2017	Mar. 24, 2017	Feb. 15, 2017	Sep. 08, 2016	Aug. 01, 2016	Apr. 14, 2016	Mar. 07, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jul. 03, 2017
Dividends Payable [Line Items]
Dividends declared (in dollars per share)					$ 0.04		$ 0.04		$ 0.02		$ 0.08			$ 0.97		$ 0.1
Dividends paid (in dollars per share)				$ 0.04		$ 0.04		$ 0.02		$ 0.08		$ 0.89	$ 0.02	$ 0.97	$ 0.10	$ 0.1
Total payment				$ 688		$ 688		$ 344		$ 1,378				$ 16,692	$ 1,722	$ 1,722
ICP
Dividends Payable [Line Items]
Equity method ownership percentage												30.00%		30.00%			30.00%
First dividend
Dividends Payable [Line Items]
Dividends declared (in dollars per share)			$ 0.85
Dividends paid (in dollars per share)		$ 0.85
Total payment		$ 14,628
Second dividend
Dividends Payable [Line Items]
Dividends declared (in dollars per share)			$ 0.04
Dividends paid (in dollars per share)	$ 0.04
Total payment	$ 688