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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 15, 2016 | Nov. 10, 2016 | Dec. 31, 2015 | Nov. 04, 2015 | Jul. 14, 2015 | Dec. 31, 2014 | Dec. 03, 2013 | Aug. 30, 2013 | Aug. 20, 2010 | Aug. 12, 2010
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$400 Million Credit Facility | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 400,000 | $ 400,000 |  | $ 400,000 |  |  |  |  |  |  |  |
$100 Million Term Loan Facility | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 100,000 |  |  | $ 100,000 |  |  |  |  |  |  | $ 100,000
$253 Million Term Loan Facility | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 253,000 |  |  | 253,000 |  |  |  |  |  | $ 253,000 |
$44 Million Term Loan Facility | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 44,000 |  |  | 44,000 |  |  |  | $ 44,000 |  |  |
$98 Million Credit Facility | Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 98,000 | 98,000 | $ 98,000 |  | 98,000 | $ 98,000 |  |  |  |  |  |
$148 Million Credit Facility | Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 148,000 | 148,000 |  |  | 148,000 |  | $ 148,000 | $ 148,000 |  |  |  |
$22 Million Term Loan Facility | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 22,000 |  |  | $ 22,000 |  | $ 22,000 |  |  | $ 22,000 |  |

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