Intangible Assets, Other Assets, Net and Goodwill Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Gross carrying amount	$ 646,466	$ 680,648
Accumulated amortization	68,562	46,465
Finite-lived intangible assets, net	577,904	634,183
Weighted average amortization period	40 years	41 years
Total intangible assets, net	613,933	670,206
Perpetual track access agreements
Non-amortizable intangible assets	35,891	35,891
Operating license
Non-amortizable intangible assets	138	132
Service agreements
Gross carrying amount	37,622	37,622
Accumulated amortization	13,547	12,214
Finite-lived intangible assets, net	24,075	25,408
Weighted average amortization period	28 years	28 years
Customer contracts and relationships
Gross carrying amount	178,603	150,532
Accumulated amortization	22,899	17,421
Finite-lived intangible assets, net	155,704	133,111
Weighted average amortization period	36 years	35 years
Track access agreements
Gross carrying amount	430,241	492,494
Accumulated amortization	32,116	16,830
Finite-lived intangible assets, net	$ 398,125	$ 475,664
Weighted average amortization period	43 years	44 years