Supplemental Condensed Consolidated Financial Information (Condensed Consolidating Balance Sheets) (Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Accounts receivable, allowance for doubtful accounts	$ 2,531	$ 2,450
Common stock, shares issued	54,055,600	52,880,134
Common stock, shares authorized	175,000,000	175,000,000
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Accounts receivable, allowance for doubtful accounts	$ 0	$ 0
Common stock, shares issued	0	0
Common stock, shares authorized	0	0
Parent
Condensed Financial Statements, Captions [Line Items]
Accounts receivable, allowance for doubtful accounts	$ 1,205	$ 0
Common stock, shares issued	54,055,600	52,880,134
Common stock, shares authorized	175,000,000	175,000,000
Combined Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Accounts receivable, allowance for doubtful accounts	$ 1,326	$ 1,245
Common stock, shares issued	0	0
Common stock, shares authorized	0	0
Combined Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Accounts receivable, allowance for doubtful accounts	$ 0	$ 1,205
Common stock, shares issued	0	0
Common stock, shares authorized	0	0