Intangible Assets Narrative (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended							12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Concession Fees [Member]	Dec. 31, 2012 Concession Fees [Member]	Dec. 31, 2013 Other Intangible Assets [Member]	Dec. 31, 2012 Other Intangible Assets [Member]	Dec. 31, 1997 Service Agreements [Member]	Dec. 31, 2013 Service Agreements [Member]	Dec. 31, 2013 Contractual Rights [Member]	Dec. 31, 2013 Other Miscellaneous Intangibles [Member]	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 18,341	$ 15,561		$ 6,800	$ 6,800	$ 11,541	$ 8,761		$ 10,077	$ 1,040	$ 424
Accumulated amortization of intangible assets				4,420	4,148	765	712
Net intangible assets	13,156	10,701
Useful life of intangible assets								25 years				5 years	70 years
Amortization of Intangible Assets	354	340	340
Future Amortization of Intangible Assets
2013	354
2014	354
2015	354
2016	354
2017	$ 354