Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts Receivable, Current	$ 2,244	$ 2,628
Accumulated depreciation	607,903	444,842
Accumulated amortization on other intangible assets	$ 90,014	$ 56,409
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Liquidation Preference, Value	$ 367,360	$ 0
Preferred Stock, Shares Authorized	4,000,000	4,000,000
Preferred Stock, Shares Issued	350,000	0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common stock shares authorized	190,000,000	100,000,000
Common stock shares issued	79,270,000	79,708,000
Treasury Stock, Common, Shares	126,000	1,024,000