Segment Reporting (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Assets
Total assets for reportable segments		$ 2,974,056		$ 2,963,130
Cash and cash equivalents	206,690	125,440	175,012	175,012	66,118	66,118
Short term investments	0	999		20,254
Other assets	120,469	120,906		106,045
TOTAL ASSETS	$ 2,885,978	$ 3,221,401		$ 3,264,441