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Long-Term Debt Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Our long-term debt consisted of the following at December 31, 2016 and 2017 (in thousands): 
 
December 31, 2016
 
December 31, 2017
Revolving credit facility, secured, floating rate
$
67,700

 
$
92,000

Term loan, secured, floating rate
138,750

 
127,500

Acquisition debt
12,245

 
10,548

Debt issuance costs, net of accumulated amortization of $4,138 and $4,442, respectively
(1,270
)
 
(967
)
Less: current portion
(13,021
)
 
(16,927
)
Total long-term debt
$
204,404

 
$
212,154
Schedule of Maturities of Long-term Debt
The aggregate maturities of our long-term debt for the next five years subsequent to December 31, 2017 and thereafter are as follows (in thousands):
Years ending December 31,
 
2018
$
16,927

2019
16,949

2020
19,068

2021
172,699

2022
530

2023 and thereafter
3,875

 
$
230,048

The aggregate maturities of our Convertible Notes for the five years subsequent to December 31, 2017 are as follows (in thousa