Credit Facilities (Tables)

12 Months Ended

Dec. 31, 2017

Line of Credit Facility [Abstract]

Schedule of Maturities of Long-term Debt

t December 31, 2017, the aggregate future maturities of long-term debt by year are as follows (in thousands):

2018	$	—
2019	75,000
2020	—
2021	—
2022	—
Total	$	75,000