Subsequent Events Subsequent Event (Details) (USD $) In Thousands, unless otherwise specified		1 Months Ended
Dec. 31, 2013 mile	Jan. 31, 2014 RCP&E [Member] employee	Jan. 03, 2014 RCP&E [Member] mile
Subsequent Event [Line Items]
Cash purchase price		$ 210,000
Employees expected to hire		180
Track miles	14,700		670

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration