Employee Benefit Plans - Defined Benefit Plan Assets at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 45,713	$ 59,096
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42,032	55,727
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,681	3,369
US Equity Securities Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,457	17,650
US Equity Securities Mutual Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,457	17,650
Non-US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19,634	21,264
Non-US Equity Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19,634	21,264
Fixed Income Securities Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,222	16,758
Fixed Income Securities Mutual Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,222	16,758
Alternative Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,681	3,369
Alternative Investment Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,681	3,369
Plan Assets, Subtotal [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	44,994	59,041
Plan Assets, Subtotal [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	41,313	55,672
Plan Assets, Subtotal [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,681	3,369
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	719	55
Cash [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 719	$ 55