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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of contributions made to multi-employer plans
Contributions we made to the multi-employer plans for the years ended December 31, 2018, 2017 and 2016 are included in the table below (in thousands):
Benefit Plan
2018
 
2017
 
2016
Pension Plan
$
3,017

 
$
3,856

 
$
3,979

Health Plan
9,310

 
11,426

 
11,530

Other plans
1,106

 
1,463

 
1,583

Total plan contributions
$
13,433

 
$
16,745

 
$
17,092