Aggregate dividends declared 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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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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SUBSEQUENT EVENTS (Details) - USD ($)		12 Months Ended
SUBSEQUENT EVENTS (Details) - USD ($)	Mar. 10, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsequent Events
Quarterly cash dividend declared (in dollars per share)		$ 1.66	$ 1.58	$ 1.50
Quarterly cash dividend declared		$ 29,136,000	$ 26,178,000	$ 24,117,000
Subsequent event \| Forecast
Subsequent Events
Quarterly cash dividend declared (in dollars per share)	$ 0.43
Quarterly cash dividend declared	$ 7,912,000