Shareholder's Equity (Details) - USD ($) $ in Thousands, shares in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	1.1
Proceeds from Issuance of Common Stock	$ 42,128	$ 1,376
At-the-market equity issuance [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock	35,700
Gross Proceeds [Member] | At-the-market equity issuance [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock	$ 36,100