CONSOLIDATED STATEMENTS OF INCOME (Unaudited) CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Gain (loss) on disposition of property of equity method investment	$ 11,486	$ 0

Gain (Loss) On Disposition Of Property Of Equity Method Investment

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration