Segment Information - Costs Incurred on Long-lived Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	$ 615,487	$ 1,895,449	$ 512,017
Operating Segments [Member] | North America [Member] | Carolinas [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	72,252	15,582	26,860
Operating Segments [Member] | North America [Member] | Chicago Milwaukee [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	21,698	248,640	49,941
Operating Segments [Member] | North America [Member] | Houston [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	70,903	116,024	46,003
Operating Segments [Member] | North America [Member] | Lehigh Central PA [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	105,725	161,925	86,245
Operating Segments [Member] | North America [Member] | Minnesota [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	28,966	38,434	41,821
Operating Segments [Member] | North America [Member] | Orlando [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	7,827	10,953	10,122
Operating Segments [Member] | North America [Member] | Philadelphia [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	32,012	17,941	93,673
Operating Segments [Member] | North America [Member] | Richmond Hampton Roads [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	10,348	15,880	8,612
Operating Segments [Member] | North America [Member] | South Florida [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	30,063	148,165	3,337
Operating Segments [Member] | North America [Member] | Southeastern PA [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	39,638	39,590	11,577
Operating Segments [Member] | North America [Member] | Tampa [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	7,262	28,655	74,304
Operating Segments [Member] | North America [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	172,495	897,831	53,412
Operating Segments [Member] | UNITED KINGDOM | United Kingdom [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	$ 16,298	$ 155,829	$ 6,110