Accrued Service Contract Liability - Limited Warranty and Service Contract (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Service Contract Accrual Activity [Roll Forward]
Balance, Beginning of Period	$ 25,910	$ 25,778	$ 24,420	$ 24,004
Service Contract Expense	4,627	7,588	19,243	19,021
Service Contract Claims Paid	(6,229)	(7,803)	(19,355)	(17,462)
Balance, End of Period	$ 24,308	$ 25,563	$ 24,308	$ 25,563