Debt - Schedule of Maturities of Long-term Debt (Details) (Mortgages [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Mortgages [Member]
Debt Instrument [Line Items]
2015, amortization	$ 8,833
2016, amortization	12,387
2017, amortization	10,070
2018, amortization	2,880
2019, amortization	2,188
2020 and thereafter, amortization	11,975
Total, amortization	48,333
2015, maturities	0
2016, maturities	0
2017, maturities	446,761
2018, maturities	262,210
2019, maturities	415,000
2022, maturities	427,675
Total, maturities	1,551,646
2015	8,833
2016	12,387
2017	456,831
2018	265,090
2019	417,188
2020 and thereafter	439,650
Total	$ 1,599,979	$ 1,602,062