Operating Leases (Future Minimum Annual Rentals) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Operating Leased Assets [Line Items]
2013	$ 106,904
2014	74,109
2015	47,466
2016	23,343
2017	7,603
2018 and thereafter	0
Total	259,425
Leased Facilities [Member]
Operating Leased Assets [Line Items]
2013	87,942
2014	64,092
2015	42,993
2016	23,343
2017	7,603
2018 and thereafter	0
Total	225,973
Leased Vehicles [Member]
Operating Leased Assets [Line Items]
2013	18,962
2014	10,017
2015	4,473
2016	0
2017	0
2018 and thereafter	0
Total	$ 33,452