Schedule of Income Tax Contingencies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of year	$ 519	$ 0
Tax position related to current year:
Additions	4,737	519
Tax positions related to prior years:
Additions	16,109	0
Settlements	(13,740)	0
Statute of limitations closures	(1,406)	0
Balance, end of year	$ 6,219	$ 519