Commitments and Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
	Mar. 21, 2011 claim	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies [Line Items]
Rent expense under operating leases		$ 114,529	$ 116,541	$ 97,587
Number of claims filed	2
Polyurethane Foam Antitrust Litigation [Member] | Pending Litigation [Member]
Commitments And Contingencies [Line Items]
Current damages sought		867,400
Standby Letters of Credit Related to Various Insurance Contracts and Foreign Vendor Commitments [Member] | Senior Secured Credit Facility [Member]
Commitments And Contingencies [Line Items]
Standby letters of credit for various insurance contracts and commitments to foreign vendors		$ 37,381	$ 47,713
Maximum [Member] | Standby Letters of Credit Related to Various Insurance Contracts and Foreign Vendor Commitments [Member] | Senior Secured Credit Facility [Member]
Commitments And Contingencies [Line Items]
Expiration period for standby letters of credit		2 years