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Summary of Significant Accounting Policies - Property, Plant and Equipment and Long-Lived Assets (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Accounting Policies [Abstract] | ||
| Capitalization of internal use computer software | $ 6,040 | $ 4,897 |
| Gain (loss) on disposal/write-down of property, plant and equipment (excluding real estate) | 333 | 1,152 |
| Gain on Sale of Real Estate, Net of Tax | 0 | 7,468 |
| Income tax expense on gain of real estate | $ 1,991 | |