Leases (Schedule of Lease Minimum Payments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Property Subject to Operating Lease [Member]
lease payments [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 31,532
Operating Leases, Future Minimum Payments, Due in Two Years	24,466
Operating Leases, Future Minimum Payments, Due in Three Years	16,851
Operating Leases, Future Minimum Payments, Due in Four Years	14,509
Operating Leases, Future Minimum Payments, Due in Five Years	3,739
Operating Leases, Future Minimum Payments, Due Thereafter	1,195
Operating Leases, Future Minimum Payments Due	92,292
Royalty Agreements [Member]
lease payments [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	17,394
Operating Leases, Future Minimum Payments, Due in Two Years	19,143
Operating Leases, Future Minimum Payments, Due in Three Years	21,070
Operating Leases, Future Minimum Payments, Due in Four Years	20,806
Operating Leases, Future Minimum Payments, Due in Five Years	22,255
Operating Leases, Future Minimum Payments, Due Thereafter	83,708
Operating Leases, Future Minimum Payments Due	$ 184,376