Business and Segment Reporting (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Segment Reporting Information [Line Items]
Total assets	$ 3,457,317	$ 3,436,491	$ 2,989,067
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	2,788,930		2,989,067
Restricted Cash [Member]
Segment Reporting Information [Line Items]
Total assets	118,010		0
Corporate cash and cash equivalents [Member]
Segment Reporting Information [Line Items]
Total assets	477,321		638,677
Other unallocated amounts [Member]
Segment Reporting Information [Line Items]
Total assets	$ 73,056		$ 32,728