Lease Commitments (Schedule of Future Minimum Rentals) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Leases [Abstract]
Operating Leases, Future Minimum Payments Due, Current	$ 26,042
Operating Leases, Future Minimum Payments, Due in Five Years	10,802
Operating Leases, Future Minimum Payments, Due in Four Years	13,554
Operating Leases, Future Minimum Payments, Due in Three Years	16,989
Operating Leases, Future Minimum Payments, Due in Two Years	19,655
Operating Leases, Future Minimum Payments, Due Thereafter	$ 24,422