Fair Value Measurements Fair Value, Reconciliation of Level 3 - Assets (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2017		Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016		Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Purchases of Convertible Debt		$ 0		$ 0	$ 1,612		$ 0
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities		(1,843)		0	(1,843)		0
Fair Value, Option, Changes in Fair Value, Gain (Loss)		(1,448)		(4,607)	(1,145)		(5,707)
AFS Securities, Beginning Asset Value		82,887		129,625	82,584
AFS Securities, Ending Asset Value		81,439		125,018	81,439		125,018
Unrealized Gains (Losses) Still Held - Assets		(1,448)	[1]	(4,607)	(1,145)	[1]	(5,707)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		0		14,788	0		14,788		$ 14,600	$ 14,588	$ 13,938	$ 14,788	$ 10,781
Payment of Contingent Consideration		(7,858)		0	(7,858)		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements)		(6,778)		0	(6,778)		(285)
Gain from changes in fair value of contingent consideration	[2]	36		850	48		4,292
Fair Value, Measurement with Unobservable Inputs, Unrealized Gain Loss	[1]	0		850	0		4,166
Convertible debt securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings	[3]	1,355		199	1,594		237
AFS Securities, Beginning Asset Value		11,931		10,173	10,038
AFS Debt Security, (losses) included in OCI		(575)		201	(533)		220
AFS Securities, Ending Asset Value		10,868		10,573	10,868		10,573
Unrealized Gains (Losses) Still Held - Assets	[1]	512		400	816		457
Redeemable preferred shares [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
AFS Securities, Beginning Asset Value		17,788		22,699	17,444
AFS Debt Security, (losses) included in OCI		(1,865)		(356)	(1,521)		(491)
AFS Securities, Ending Asset Value		15,923		22,343	15,923		22,343
Unrealized Gains (Losses) Still Held - Assets	[1]	$ (1,865)		(356)	$ (1,521)		$ (491)
Monster LP [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Option, Changes in Fair Value, Gain (Loss)				$ (4,607)

[1] Represents the unrealized losses or gains recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.

[2] Changes in the fair value of contingent consideration liabilities are classified within "Acquisition-related expense (benefit), net" on the condensed consolidated statements of operations.

[3] Represents a gain at maturity of a previously impaired convertible debt security, accretion of interest income and changes in the fair value of an embedded derivative.