Goodwill and Intangible Assets - Gross Carrying Amount and Accumulated Amortization of Intangible Assets other than Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Intangible assets with finite lives:
Intangible assets with finite lives, impairment	$ (109,910)	$ (109,910)
Intangible assets with finite lives, Accumulated Amortization	(109,744)	(99,587)
Intangible assets, Acquisition Costs	383,569	369,994
Intangible assets, Net Carrying Amount	163,915	160,497
Customer-related and other
Intangible assets with finite lives:
Intangible assets with finite lives, Acquisition Costs	83,545	80,685
Intangible assets with finite lives, impairment	0	0
Intangible assets with finite lives, Accumulated Amortization	(43,339)	(41,398)
Intangible assets with finite lives, Net Carrying Amount	40,206	39,287
Trademarks
Intangible assets with finite lives:
Intangible assets with finite lives, Acquisition Costs	230,709	230,709
Intangible assets with finite lives, impairment	(109,910)	(109,910)
Intangible assets with finite lives, Accumulated Amortization	(66,405)	(58,189)
Intangible assets with finite lives, Net Carrying Amount	54,394	62,610
Trademarks
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Intangible assets with indefinite lives, Acquisition Costs	$ 69,315	$ 58,600