Segment Reporting (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012		Jun. 30, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 211,434		$ 249,531	$ 125,440	$ 142,915		$ 199,397	$ 175,012
Short term investments	0			999
Other assets	113,315			120,906
TOTAL ASSETS	3,636,917			3,221,401
Reportable Segment [Member]
Assets
Total assets for reportable segments	3,312,168			2,974,056
TOTAL ASSETS	$ 3,312,168	[1]			$ 2,912,992	[1]

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