Debt - Texadian Uncommitted Credit Agreement (Details) - USD ($)	Feb. 20, 2015	Jun. 12, 2013
Texadian Uncommitted Credit Agreement
Debt Instrument [Line Items]
Line credit maximum borrowing amount		$ 50,000,000
Texadian Canada | Texadian Uncommitted Credit Agreement
Debt Instrument [Line Items]
Ownership interested pledged as collaterall		65.00%
Texadian | Texadian Uncommitted Credit Agreement
Debt Instrument [Line Items]
Ownership interested pledged as collaterall		100.00%
Texadian Uncommitted Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Line credit maximum borrowing amount	$ 200,000,000