Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Apr. 04, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Common stock, par value	$ 0.20			$ 0.20
Common stock, shares issued	52,889,118			51,494,318
Proceeds from issuance of common stock, net of issuance costs	$ 18,623	$ 0
At-the-Market Common Stock Program [Member]
Class of Stock [Line Items]
Common stock, par value			$ 0.20
Aggregate Offering Price			$ 100,000
Commission of the gross sales price by share paid percentage			2.00%
Common stock, shares issued	787,547
Proceeds from issuance of common stock, net of issuance costs	$ 18,600