Leasing (Future Minimum Lease Payments for Operating and Capital Leases) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Related parties [Member] | Operating lease expense [Member]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015	$ 4,621
2016	4,659
2017	4,526
2018	4,318
2019	2,756
Thereafter	8,917
Total	29,797
Non-related parties [Member] | Capital lease expense [Member]
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015	25
2016	0
2017	0
2018	0
2019	0
Thereafter	0
Total	25
Non-related parties [Member] | Operating lease expense [Member]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015	247,477
2016	234,267
2017	216,739
2018	191,781
2019	169,271
Thereafter	932,179
Total	1,991,714
Lease Agreements [Member]
2015	252,123
2016	238,926
2017	221,265
2018	196,099
2019	172,027
Thereafter	941,096
Total	$ 2,021,536