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 the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

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- Definition

Fixed interest rate related to the interest rate derivative.

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Subsequent Events - Narrative (Details) - USD ($)		3 Months Ended								12 Months Ended
Subsequent Events - Narrative (Details) - USD ($)	Feb. 19, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 15, 2016
Subsequent Event [Line Items]
Quarterly cash dividend approved		$ 0.1	$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.37	$ 0.36	$ 0.34
Subsequent Event
Subsequent Event [Line Items]
Quarterly cash dividend approved	$ 0.10
Cash Flow Hedging \| Designated as Hedging Instrument \| Subsequent Event \| Interest Rate Swap
Subsequent Event [Line Items]
Derivative, amount of borrowings covered by swap													$ 50,000,000
Derivative, fixed interest rate													1.451%