Defined Benefit Plans - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) plan	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Domestic
Defined Benefit Plan Disclosure [Line Items]
Estimated unrecognized loss that will be amortized from AOCI, net of income taxes	$ 200
Number of plans | plan	2
Benefit obligation	$ 7,000	$ 6,700
Fair value of plan assets	$ 4,900	$ 5,100
Annual rate of return on plan assets	7.00%	7.00%
Estimated future benefit payments	$ 400
Maximum | Domestic
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.00%	4.50%
Minimum | Domestic
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.80%	4.30%
United Kingdom Subsidiary | UK Plan
Defined Benefit Plan Disclosure [Line Items]
Underfunded status of UK Plan	$ 32,270	$ 50,711
Annual rate of inflation	2.00%	2.00%
Average life expectancy	27 years
Estimated unrecognized loss that will be amortized from AOCI, net of income taxes	$ 1,800
Future estimated employer contributions to be paid next year	5,400
Benefit obligation	295,825	$ 332,806	$ 308,877
Fair value of plan assets	$ 263,555	$ 282,095	$ 269,811
Discount rate	3.80%	3.60%
Annual rate of return on plan assets	6.30%	6.70%	6.70%
Selling, General and Administrative Expenses | Domestic
Defined Benefit Plan Disclosure [Line Items]
Reclassification adjustment from AOCI, net of income taxes	$ 200	$ 200	$ 300
Selling, General and Administrative Expenses | United Kingdom Subsidiary | UK Plan
Defined Benefit Plan Disclosure [Line Items]
Reclassification adjustment from AOCI, net of income taxes	2,000	1,600	$ 2,000
Other Noncurrent Liabilities | United Kingdom Subsidiary | UK Plan
Defined Benefit Plan Disclosure [Line Items]
Underfunded status of UK Plan	$ 32,270	$ 50,711