Partners' Capital and Partnership Distributions (Details 2) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2013 |
Sep. 30, 2013 |
Jun. 30, 2013 |
Mar. 31, 2013 |
Dec. 31, 2012 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Equity [Abstract] | |||||||||||||||
| Amount paid to CRLLC | $ 0 | $ 15,200 | $ 17,500 | $ 16,000 | $ 10,500 | $ 12,800 | $ 14,800 | $ 16,700 | $ 14,000 | $ 22,700 | $ 31,100 | $ 9,800 | |||
| Amounts paid to public unitholders | 0 | 13,300 | 15,400 | 14,000 | 9,200 | 11,300 | 13,000 | 14,700 | 12,300 | 19,900 | 13,500 | 4,200 | |||
| Total amount paid | $ 0 | $ 28,500 | $ 32,900 | $ 30,000 | $ 19,700 | $ 24,100 | $ 27,800 | $ 31,400 | $ 26,300 | $ 42,600 | $ 44,600 | $ 14,000 | |||
| Per common unit (in dollars per share) | $ 0 | $ 0.39 | $ 0.45 | $ 0.41 | $ 0.27 | $ 0.33 | $ 0.38 | $ 0.43 | $ 0.36 | $ 0.583 | $ 0.610 | $ 0.192 | |||
| Common units outstanding (in thousands) (in units) | 73,123,000 | 73,123,000 | 73,123,000 | 73,122,997 | 73,117,000 | 73,114,000 | 73,113,000 | 73,113,000 | 73,078,000 | 73,075,000 | 73,065,000 | 73,065,000 | 73,128,269 | 73,122,997 | 73,113,000 |
| Total cash distributions paid to CRLLC | $ 48,650 | $ 54,877 | $ 77,539 | ||||||||||||
| Total cash distributions paid to public unitholders | 42,754 | 48,213 | 49,970 | ||||||||||||
| Total amount of cash distributions paid | $ 91,400 | $ 103,100 | $ 127,500 | ||||||||||||
| Per common unit of (in dollars per share) | $ 1.25 | $ 1.41 | $ 1.745 | ||||||||||||