Segment Reporting (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Segment Reporting [Abstract]
Assets, Net		$ 2,558,819
Assets
Cash and cash equivalents	272,932	206,690	331,311	125,440
Short term investments	45,628	0
Other assets	116,529	120,469
TOTAL ASSETS	$ 2,986,985	$ 2,885,978