Non-controlling Interest (Schedule of Changes in Non-controlling Interest) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Non-controlling Interest [Abstract]
Balance at beginning of period		$ 1,842
Net income attributable to non-controlling interest in consolidated subsidiary		20	734
Purchase of non-controlling interest in consolidated subsidiary		(1,862)
Balance at end of period			$ 1,842