Fair Value Measurements (Details 1) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Assets:
Marketable equity securities		$ 22,541	$ 87,659
Liabilities:
Interest rate swaps	[1]	1,349	1,404
Fair Value Measurements, Recurring [Member] | Level 1 [Member]
Assets:
Marketable equity securities		$ 22,541	$ 87,659
Liabilities:
Interest rate swaps	[1]
Fair Value Measurements, Recurring [Member] | Level 2 [Member]
Assets:
Marketable equity securities
Liabilities:
Interest rate swaps	[1]	$ 1,349	$ 1,404
Fair Value Measurements, Recurring [Member] | Level 3 [Member]
Assets:
Marketable equity securities
Liabilities:
Interest rate swaps	[1]

[1] Included in Other liabilities on the Company's Condensed Consolidated Balance Sheets