Segment Information (Net Sales by Region or Origin and Long-Lived Assets by Region of Domicile) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 282,093	$ 304,994	$ 253,171	$ 200,615	$ 201,994	$ 234,101	$ 234,960	$ 191,032	$ 1,040,873	$ 862,087	$ 827,567
Long-lived assets	122,947				131,781				122,947	131,781	134,026
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									968,414	816,473	784,926
Long-lived assets	110,571				122,824				110,571	122,824	125,816
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									48,216	45,614	42,641
Long-lived assets	11,084				8,957				11,084	8,957	8,210
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									24,243	0	0
Long-lived assets	$ 1,292				$ 0				$ 1,292	$ 0	$ 0