Long Term Liabilities (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Maturities Of Long Term Debt One Year [Member]
Long Term Debt Maturities	$ 0
Maturities Of Long Term Debt 2014 [Member]
Long Term Debt Maturities	0
Maturities Of Long Term Debt 2015 [Member]
Long Term Debt Maturities	100,000
Maturities Of Long Term Debt 2016 [Member]
Long Term Debt Maturities	339,000
Maturities of Long Term Debt 2017 [Member]
Long Term Debt Maturities	116,000
Maturities Of Long Term Debt Beyond Five Years [Member]
Long Term Debt Maturities	$ 1,282,000