Summary of Significant Accounting Policies - Property, Plant and Equipment and Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accounting Policies [Abstract]
Capitalization of internal use computer software	$ 6,395	$ 4,861	$ 12,435	$ 9,758
Gain (loss) on disposal/write-down of property, plant and equipment (excluding real estate)	$ 515	$ (107)	848	1,045
Gain on Sale of Real Estate, Net of Tax			$ 0	7,468
Income tax expense on gain of real estate				$ 1,991