Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts Receivable, Current	$ 2,322	$ 3,019
Accumulated depreciation	393,635	319,769
Accumulated amortization on other intangible assets	$ 39,018	$ 29,515
Par value per share	$ 0.01	$ 0.01
Common stock shares authorized	100,000	100,000
Common stock shares issued	67,079	44,863
Treasury Stock, Common, Shares	980	931