Segment Information - Costs Incurred on Long-lived Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	$ 1,895,449	$ 512,017	$ 437,073
Operating Segments [Member] | North America [Member] | Lehigh Central PA [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	161,925	86,245	66,472
Operating Segments [Member] | North America [Member] | Chicago Milwaukee [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	248,640	49,941	55,077
Operating Segments [Member] | North America [Member] | Houston [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	116,024	46,003	10,188
Operating Segments [Member] | North America [Member] | Carolinas [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	15,582	26,860	85,732
Operating Segments [Member] | North America [Member] | Industrial Other [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	664,008	21,065	13,006
Operating Segments [Member] | North America [Member] | Minnesota [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	38,434	41,821	45,595
Operating Segments [Member] | North America [Member] | South Florida [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	148,165	3,337	23,493
Operating Segments [Member] | North America [Member] | Richmond Hampton Roads [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	15,880	8,612	5,920
Operating Segments [Member] | North America [Member] | Arizona [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	68,138	35,750	8,794
Operating Segments [Member] | North America [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	79,813	80,402	4,914
Operating Segments [Member] | North America [Member] | Philadelphia [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	17,941	93,673	49,407
Operating Segments [Member] | North America [Member] | Southeastern PA [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	39,590	11,577	14,851
Operating Segments [Member] | North America [Member] | Washington DC [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	125,480	621	48,786
Operating Segments [Member] | European Union [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	$ 155,829	$ 6,110	$ 4,838