Summary of Significant Accounting Policies (Details-3) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash Provided by Operating Activities	$ 153,040,000	$ 131,373,000	$ 147,864,000
Cash Used for Investing Activities	(218,328,000)	(116,275,000)	(86,813,000)
Change in cash, cash equivalents, and restricted cash	(27,165,000)	10,461,000	14,939,000
Cash, cash equivalents, and restricted cash at beginning of period	112,094,000	101,633,000	86,694,000
Cash, cash equivalents, and restricted cash at end of period	84,929,000	112,094,000	101,633,000
Accounting Standards Update 2016-18 - Restricted Cash [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash Provided by Operating Activities		(1,618,000)	351,000
Cash Used for Investing Activities		86,000	13,000
Change in cash, cash equivalents, and restricted cash		(1,532,000)	364,000
Cash, cash equivalents, and restricted cash at beginning of period	$ 4,142,000	5,674,000	5,310,000
Cash, cash equivalents, and restricted cash at end of period		$ 4,142,000	$ 5,674,000