Consolidating Condensed Financial Information (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jun. 30, 2007 7.50% Senior Subordinated Notes due 2015	Dec. 31, 2012 ACDL	Dec. 31, 2012 Non Material Subsidiary
Long-term Debt
Cash and other assets	$ 101,792,000	$ 80,294,000	$ 195,387,000	$ 129,576,000			$ 4,400,000
Stated percentage					7.50%
Cash and other assets	$ 37,800,000					$ 37,800,000