Intangible Assets, Other Assets, Net and Goodwill Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Balance at beginning of period	$ 628,815,000	$ 630,462,000
Goodwill acquired	216,053,000	2,409,000
Goodwill, purchase accounting adjustments	(6,895,000)	295,000
Currency translation adjustment	(11,398,000)	(4,351,000)
Balance at end of period	826,575,000	628,815,000
North American Operations [Member]
Segment Reporting Information [Line Items]
Balance at beginning of period	615,403,000	615,228,000
Goodwill acquired	920,000	2,409,000
Goodwill, purchase accounting adjustments	(6,895,000)	295,000
Currency translation adjustment	(4,194,000)	(2,529,000)
Balance at end of period	605,234,000	615,403,000
Australian Operations [Member]
Segment Reporting Information [Line Items]
Balance at beginning of period	0	0
Goodwill acquired	42,312,000	0
Goodwill, purchase accounting adjustments	0	0
Currency translation adjustment	(3,000,000)	0
Balance at end of period	39,312,000	0
U.K./European Operations [Member]
Segment Reporting Information [Line Items]
Balance at beginning of period	13,412,000	15,234,000
Goodwill acquired	172,821,000	0
Goodwill, purchase accounting adjustments	0	0
Currency translation adjustment	(4,204,000)	(1,822,000)
Balance at end of period	$ 182,029,000	$ 13,412,000