Income Taxes Deferred Tax Summary (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Net deferred tax assets	$ 13,797	$ 14,401
Deferred Tax Liabilities, Noncurrent	(51,306)	(57,661)
Deferred Tax Assets (Liabilities), Net	$ (37,509)	$ (43,260)